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DROK DC Voltmeter Ammeter Dual Display

SKU Img. DC Power Supply Measure Voltage Measure Current Shunt Display Wires Dimension Cutting Size US UK DE
300005 DC 3.5-28VDC 0.00-33.00V 0-999.9mA-3A Donot Need Shunt 0.28″ LED Red/Blue 5 Wires 48x29x21mm 45.5×26.5 mm US DE
300006 DC 3.5-28VDC 0.00-33.00V 0-999.9mA-3A Donot Need Shunt 0.28″ LED Red/Blue 5 Wires 48x29x21mm 45.5×26.5 mm US DE
300007 DC 3.5-28VDC 0.00-33.00V 0-999.9mA-3A Donot Need Shunt 0.28″ LED Red/Blue 5 Wires 48x29x21mm 45.5×26.5 mm US DE
100381 DC 4-30VDC 0.00-99.9V +/- 0.1-9.99A Donot Need Shunt 0.28″ LED Red/Blue 3 Wires 54x30x21 mm 47.2×27.3 mm US DE
100171  DC Voltmeter Ammeter DC 4.5-30VDC 4.5-30V 2A Donot Need Shunt 0.28″ LED Red/Blue 3 Wires 48×29×21 mm 45.5×26.5 mm US UK DE
100172  DC Voltmeter Ammeter DC 4.5-30VDC 4.5-30V 5A Donot Need Shunt 0.28″ LED Red/Blue 3 Wires 48×29×21 mm 45.5×26.5 mm US UK DE
100173  DC Voltmeter Ammeter DC 4.5-30VDC 4.5-30V 10A Donot Need Shunt 0.28″ LED Red/Blue 3 Wires 48×29×21 mm 45.5×26.5 mm US UK DE
100176  DC Voltmeter Ammeter DC 4.5-30VDC 4.5-30V 50A with shunt 0.28″ LED Red/Blue 3 Wires 48×29×21 mm 45.5×26.5 mm US UK DE
100177  DC Voltmeter Ammeter DC 4.5-30VDC 4.5-30V 100A with shunt 0.28″ LED Red/Blue 3 Wires 48×29×21 mm 45.5×26.5 mm US UK DE
100012  DC Voltmeter Ammeter DC 4.5-30VDC 0.00-99.9V 2A Donot Need Shunt 0.28″ LED Red/Blue 5 Wires 48×29×21 mm 45.5×26.5 mm US UK DE
100013  DC Voltmeter Ammeter DC 4.5-30VDC 0.00-99.9V 5A Donot Need Shunt 0.28″ LED Red/Blue 5 Wires 48×29×21 mm 45.5×26.5 mm US UK DE
100014  DC Voltmeter Ammeter DC 4.5-30VDC 0.00-99.9V 10A Donot Need Shunt 0.28″ LED Red/Blue 5 Wires 48×29×21 mm 45.5×26.5 mm US UK DE
100045  DC Voltmeter Ammeter DC 4.5-30VDC 0.00-99.9V 50A with shunt 0.28″ LED Red/Blue 5 Wires 48×29×21 mm 45.5×26.5 mm US UK DE
100046  DC Voltmeter Ammeter DC 4.5-30VDC 0.00-99.9V 100A with shunt 0.28″ LED Red/Blue 5 Wires 48×29×21 mm 45.5×26.5 mm US UK DE
100382 DC 4-30VDC 0.00-99.9V +/-  0.10-20.0A with CT 0.28″ LED Red/Blue 3 Wires 54x30x21 mm 47.2×27.3 mm US DE
100383 DC 4-30VDC 0.00-99.9V +/-  0.0-50.0A with CT 0.28″ LED Red/Blue 3 Wires 54x30x21 mm 47.2×27.3 mm US DE
100384 DC 4-30VDC 0.00-99.9V +/-  0.0-99.9A with CT 0.28″ LED Red/Blue 3 Wires 54x30x21 mm 47.2×27.3 mm US DE
100385 DC 4-30VDC 0.00-99.9V +/-  0-200A with CT 0.28″ LED Red/Blue 3 Wires 54x30x21 mm 47.2×27.3 mm US DE
100386 DC 4-30VDC 0.00-99.9V +/-  0-300A with CT 0.28″ LED Red/Blue 3 Wires 54x30x21 mm 47.2×27.3 mm US DE
100387 DC 4-30VDC 0.0-300V +/- 0.1-9.99A with CT 0.28″ LED Red/Blue 3 Wires 54x30x21 mm 47.2×27.3 mm US DE
100388 DC 4-30VDC 0.0-300V +/-  0.10-20.0A with CT 0.28″ LED Red/Blue 3 Wires 54x30x21 mm 47.2×27.3 mm US DE
100389 DC 4-30VDC 0.0-300V +/-  0.0-50.0A with CT 0.28″ LED Red/Blue 3 Wires 54x30x21 mm 47.2×27.3 mm US DE
100390 DC 4-30VDC 0.0-300V +/-  0.0-99.9A with CT 0.28″ LED Red/Blue 3 Wires 54x30x21 mm 47.2×27.3 mm US DE
100391 DC 4-30VDC 0.0-300V +/-  0-200A with CT 0.28″ LED Red/Blue 3 Wires 54x30x21 mm 47.2×27.3 mm US DE
100392 DC 4-30VDC 0.0-300V +/-  0-300A with CT 0.28″ LED Red/Blue 3 Wires 54x30x21 mm 47.2×27.3 mm US DE
100393 DC 4-30VDC 0-600V +/- 0.1-9.99A Donot Need Shunt 0.28″ LED Red/Blue 3 Wires 54x30x21 mm 47.2×27.3 mm US DE
100394 DC 4-30VDC 0-600V +/-  0.10-20.0A with CT 0.28″ LED Red/Blue 3 Wires 54x30x21 mm 47.2×27.3 mm US DE
100395 DC 4-30VDC 0-600V +/-  0.0-50.0A with CT 0.28″ LED Red/Blue 3 Wires 54x30x21 mm 47.2×27.3 mm US DE
100396 DC 4-30VDC 0-600V +/-  0.0-99.9A with CT 0.28″ LED Red/Blue 3 Wires 54x30x21 mm 47.2×27.3 mm US DE
100397 DC 4-30VDC 0-600V +/-  0-200A with CT 0.28″ LED Red/Blue 3 Wires 54x30x21 mm 47.2×27.3 mm US DE
100398 DC 4-30VDC 0-600V +/-  0-300A with CT 0.28″ LED Red/Blue 3 Wires 54x30x21 mm 47.2×27.3 mm US DE
100412 DC 3-40VDC 0-19.99V 0-10.00A Donot Need Shunt LCD 5 Wires 70x40x39 mm 43×25 mm US DE
100413 DC 3-40VDC 0-19.99V 0-50.0A with shunt LCD 5 Wires 70x40x39 mm 43×25 mm US DE
100414 DC 3-40VDC 0-199.9V  0-1.999A Donot Need Shunt LCD 5 Wires 70x40x39 mm 43×25 mm US DE
100415 DC 3-40VDC 0-199.9V  0-10.00A Donot Need Shunt LCD 5 Wires 70x40x39 mm 43×25 mm US DE
100416 DC 3-40VDC 0-199.9V 0-19.99A with shunt LCD 5 Wires 70x40x39 mm 43×25 mm US DE
100417 DC 3-40VDC 0-199.9V 0-50.0A with shunt LCD 5 Wires 70x40x39 mm 43×25 mm US DE
100418 DC 3-40VDC 0-199.9V 0-100.0A with shunt LCD 5 Wires 70x40x39 mm 43×25 mm US DE
100419 DC 3-40VDC 0-199.9V 0-200A with shunt LCD 5 Wires 70x40x39 mm 43×25 mm US DE
100420 DC 3-40VDC 0-600V 0-10.00A Donot Need Shunt LCD 5 Wires 70x40x39 mm 43×25 mm US DE
100421 DC 3-40VDC 0-600V 0-50.0A with shunt LCD 5 Wires 70x40x39 mm 43×25 mm US DE
100422 DC 3-40VDC 0-600V 0-100.0A with shunt LCD 5 Wires 70x40x39 mm 43×25 mm US DE
100109 DC 220VAC 0-19.99VDC 0-1.999A Donot Need Shunt LCD 6 Wires 70x40x39 mm 68×38 mm US UK DE
100106 DC 220VAC 0-19.99VDC 0-5.00A Donot Need Shunt LCD 6 Wires 70x40x39 mm 68×38 mm US DE
100107 DC 220VAC 0-19.99VDC 0-10.00A Donot Need Shunt LCD 6 Wires 70x40x39 mm 68×38 mm US UK DE
100108 DC 220VAC 0-19.99VDC 0-50.0A with shunt LCD 6 Wires 70x40x39 mm 68×38 mm US DE
100117 DC 220VAC 0-199.9VDC 0-10.00A Donot Need Shunt LCD 6 Wires 70x40x39 mm 68×38 mm US UK DE
100118 DC 220VAC 0-199.9VDC 0-19.99A with shunt LCD 6 Wires 70x40x39 mm 68×38 mm US UK DE
100119 DC 220VAC 0-199.9VDC 0-50.0A with shunt LCD 6 Wires 70x40x39 mm 68×38 mm US DE
100137 DC 220VAC 0-199.9VDC 0-100A with shunt LCD 6 Wires 70x40x39 mm 68×38 mm US DE
100120 DC 220VAC 0-199.9VDC 0-200A with shunt LCD 6 Wires 70x40x39 mm 68×38 mm US DE
100121 DC 220VAC 0-600VDC 0-10.00A Donot Need Shunt LCD 6 Wires 70x40x39 mm 68×38 mm US UK DE
100122 DC 220VAC 0-600VDC 0-50.0A with shunt LCD 6 Wires 70x40x39 mm 68×38 mm US UK DE
By | 2018-02-28T06:33:10+00:00 August 11th, 2015|Categories: DC Voltmeter Ammeter|80 Comments

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80 Comments

  1. Thomas Lynch September 4, 2015 at 3:48 pm - Reply

    I just purchased the 300 amp version of this meter. There are no instructions included with it, allowing me to make sure it is installed properly. Also has a VERY large blue plastic/metal item which is wired to the display. The wires are only about 2 inches long, which prohibits mounting of the display in the intended location. Please identify the wires and explain to me why it was not stated that the large blue piece was included?

    • Drok September 7, 2015 at 4:10 am - Reply

      Hi, sorry that we don’t have paper instructions for those DIY product and all the information is on the website. Did you get this 100V 300A Meter? The blue one is transformer. You can extend the wires by your need. Below is the diagram. If you have any other questions, don’t hesitate to write back to us.
      100386 diagram

      Best regards,
      DROK

      • Rafael Lucas May 19, 2016 at 5:25 pm - Reply

        I purchased the 100V / 300A model recently (ASIN: B00YBUD1CE). The product is priced very well, and is solidly built. Like other buyers, I need to mount the transformer about 1m – 1.5m from the meter panel. The provided 3-wire white/blue connection is too short for my application. Do you sell extension wires for the transformer? If not, can you provide specifications for the wire/connectors so that I can make my own or order the proper one from another source? Please provide connectory type/model, recommended wire type / gauge / sheilding. My application is for automotive use in a diesel-powered truck, measuring current coming off the alternator. If you know of a product on Amazon (USA) that I could use for the extension, please provide ASIN. Also, it would be nice to mount the meter in a industry standard round 52mm gauge pod. Other than the end user/installer custom making a round plastic or metal mounting plate, have you considered making such a meter and/or mounting adapter? Thank you

        • Drok May 20, 2016 at 2:49 am - Reply

          Hi Rafael Lucas,
          The wire is for current transformer of Holzer current & voltmeter meter.
          One side of the wire is 3 pins male plug and the other side is 3 pins female plug.
          As your description, you want to apply this product to measure the current coming off the alternator, please note that this product is a DC meter for measuring DC current.
          Hope this can help you.
          Best regards

      • John Morr September 13, 2016 at 4:50 pm - Reply

        I have an Elenco PSU XP-720K as a soldering kit. I want to ad this gauge to the power supply on the 1-30VDC rail. I can power the LED’s from the 5V rail. I have asked and searched an see no diagrams that show this useage. I thought I figured it out. Then was directed to this site and now have conflicting information.
        My understanding is
        The Skinny red to the 5V red pole.
        Skinny black and fat black to common ground.
        The red and yellow to the 1-30V rail.
        Is this correct?
        Amazon store page says the opposite. “If just be used as a voltmeter, it is recommended that the yellow line and the black line were connected together, to prevent the ammeter digital flashing” This site conflicts with this statement.

        • Drok September 14, 2016 at 2:35 am - Reply

          Hello John Morr,
          Thank you for writing in.
          Could you please tell us the ASIN or the link of the product so that we can ensure which product you are referring to?
          With your help, we can find a solution more quickly.
          Looking forward to hearing from you.
          Best regards

    • Jeff Johnson July 9, 2016 at 4:23 pm - Reply

      On the 200A and 300A versions of this VA meter with CT for DC measurement. How long can you extend the wires from the CT to the meter? What wire is recommended? Is shielding or twisted pair or wire size important?

      • Drok July 11, 2016 at 2:06 am - Reply

        Hello Jeff Johnson,
        Thank you for writing in.
        Since many product are with similar parameters, it is hard for us to ensure the product you are referring to.
        Could you please send us the link of the products?
        With your help, we can find a solution more quickly.
        Best regards

        • Jeff Johnson July 11, 2016 at 8:43 pm - Reply

          Sure. This is what I purchased. I wish to extend the meter from the CT by about 50′ of wire.

          https://www.amazon.com/gp/product/B00YBYF8BW/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1

          • Drok July 12, 2016 at 2:23 am

            Hello Jeff Johnson,
            Thank you for your reply.
            The extended length of the wire from CT to the meter depends on the working environment.
            If there is large disturbance or the length of the wire is too long, the wire should be shielding wire.
            And it is recommended that the length of the wire is within 3 meters.
            50′of the wire is too long, which will have a effect in measuring.
            Hope this can help you.
            Best regards

    • Fred Behning May 6, 2017 at 4:55 pm - Reply

      I have a DC 600V 100A with CT unit (http://www.ebay.com/itm/DC-600V-Red-LED-Voltmeter-Ammeter-Amp-Dual-Digital-Volt-Meter-Gauge-100A-hv2n-/272391801857?hash=item3f6bd10c01:g:NVQAAOSw4shX6PPk). Your wiring diagram calls for a common ground. My high voltage circuit and 12v circuit are isolated from one another so there is no common ground. Is there a way to wire this so it will display the voltage and amps from the high voltage circuit and receive internal power from the 12V?

      • Fred Behning July 14, 2017 at 4:15 pm - Reply

        Hello? Anyone there? Still looking for an answer, and “It won’t work” is a perfectly acceptable answer. If there’s a way, however, I’d like to know.

        • Drok July 16, 2017 at 8:10 am - Reply

          Hello Fred Behning,
          Thanks for writing in.
          If you have any questions,please kindly tell us more details so that we can solve problem for you quickly.
          Best regards.

          • Fred Behning July 22, 2017 at 12:23 am

            My question was detailed in my original post: “I have a DC 600V 100A with CT unit (http://www.ebay.com/itm/DC-600V-Red-LED-Voltmeter-Ammeter-Amp-Dual-Digital-Volt-Meter-Gauge-100A-hv2n-/272391801857?hash=item3f6bd10c01:g:NVQAAOSw4shX6PPk). Your wiring diagram calls for a common ground. My high voltage circuit and 12v circuit are isolated from one another so there is no common ground. Is there a way to wire this so it will display the voltage and amps from the high voltage circuit and receive internal power from the 12V?” Let me know if you need more information. Thanks

          • Drok July 24, 2017 at 8:32 am

            Hello Fred Behning,
            Thanks for reply.
            We are sorry we can’t ensure if the item you bought is the same to one we have. We found the item from this link is not sold by us. Except “iawoo” and “kuuco” these two stores, we don’t have other stores in ebay. We are afraid we will offer a misguidance.
            Would you please kindly contact seller directly?
            Best regards.

  2. Francisco Soule October 30, 2015 at 5:40 pm - Reply

    Hello

    My son bought a 5 Wires DC Voltmeter Ammeter Dual Display one month ago and we want to use it but we do not have the manual to check how we have to connect each cable .. do you have an example diagram that we can follow ?

    we will appreciate a lot if you can provide us with this information..

    • Drok November 2, 2015 at 2:13 am - Reply

      Hi,
      Thanks for your business. Sorry that we don’t have paper instruction for those DIY products and all the information are on the website. Could you please tell us your order number or the ASIN of the item first?
      Looking forward to your reply.
      Thanks!
      DROK Service Team

      • Terrence James, PE March 7, 2016 at 3:26 pm - Reply

        If the specs for your panel meters are on your website I cannot find them. The meter I bought had ZERO documentation. None. Who sells products with no specs, no wiring diagrams? That is crazy. Your 5 wire meter has two reds, two blacks, and one yellow wire. I guess we’re suposed to just guess and buy anither one if it smokes.

        • Drok March 9, 2016 at 1:52 am - Reply

          Hello Terrence James, PE，
          Thank you for writing in. We are sorry for any inconvenience caused on you.
          Since most of our products are semi-finished products, there is no hardcopy manuals for them.
          We are trying our best to improve them.
          If you have any questions, please feel free to contact us, we are always here to assist you.
          Beg your forgiveness and understanding.
          Best regards

        • john walker May 9, 2016 at 11:23 pm - Reply

          Hi i have bought the same meter as you with no current shunt , ie green/red display 0-33v the connection diagram on Amazon(uk) shows back of panel with red+ supply Yellow + (volt displayed ) and black- or gnd that takes care of the top voltage display .

          The bottom red/black leads are the bottom current display which need to be placed in the gnd/neg side according to the diagram ! if used as a charger circuit you connect blk to gnd but if used as a power supply unit red is connected to gnd. note max current looks like 3A without a shunt ,but this is not made clear by the diagram ,so i shall make a wire shunt myself adjusted to read 30a max.
          to suit my amateur radio mobile rig when not in car as a back up supply when camping.

          • Drok May 10, 2016 at 1:37 am

            Hello john walker,
            Thank you for writing in.
            Could you please tell us your order ID or the link of the product?
            With your help, we can find a solution more quickly.
            Best regards

  3. Hans November 17, 2015 at 11:59 am - Reply

    I bought the 30V – 50A meter via amazon.de. It came witjout a shunt resistor, hence is useless for current measurement. Should the shunt have been in the packet? It was not offered as an addon on amazon, and not visible on the fotos of the product. On the other hand, a shunt was mentioned several times in the ratingsgiven for the product by amazon customers.

  4. Rudy November 22, 2015 at 2:18 am - Reply

    I purchased 2 Drok AC Volt & Amp meters that are operating as designed. Thank you. What I am looking for is an ammeter with alarms. Example: I have two motors in parallel that consume 13 amps, if one motor fails, I want my ammeter to alarm when the ampere goes below 10.
    Do you have an Ammeter with alarm capability?

    • Drok November 23, 2015 at 10:12 am - Reply

      Hello, sorry we don’t have such Ammeter with alarm capability. Thanks for your understanding. Regards!

    • Cade January 8, 2017 at 12:29 am - Reply

      This has made my day. I wish all posnitgs were this good.

  5. Stainless November 23, 2015 at 1:34 pm - Reply

    I have bought three wire voltmeter / ammeter in 50 amp and 100 amp complete with shunts from Amazon UK. The voltages on both are very accurate, but the current readings on both are around 10% of the actual current going through the shunt. When connecting a 15 ohm power resistor at 15 volts, both meters read around 0.1 amp instead of the correct 1 amp. The current potentiometers hardly vary the reading. Why are these meters so bad at measuring current ?

    • Drok November 24, 2015 at 10:27 am - Reply

      Hi, could you please tell us which product do you want to know. Maybe you can give us the product link or your order number. Also, please provide more details about your using environment and wiring connections. If you can, we sincerely hope that could you please send us a picture to let us check what is the problem detail? Looking forward to your reply. Regards!

  6. Neal January 12, 2016 at 4:05 am - Reply

    I purchased three of the DROK D69 600VDC Digital Meters.
    There are no wiring instructions.
    Can you please post the wiring instructions and polarity for proper connection.?

    Thank You

    • Drok January 12, 2016 at 8:16 am - Reply

      Hi, Neal
      Could you please let us know the Asin or part number of the item you bought?
      We have several different 600VDC Digital Meters, so we can’t make sure which one you purchased.
      Best regards

  7. Federico January 12, 2016 at 5:13 pm - Reply

    Buongiorno abbiamo comprato a fine dicembre uno strumento cod. Dekor 028 digitale led, ma non funziona più, va a colpi il voolmetro e anche l’amperometro.
    Come possiamo risolvere il problema?

    Cordiali Saluti,
    Casa della Batteria di Carpi.

    • Drok January 13, 2016 at 6:42 am - Reply

      Caro amico,
      Grazie per la vostra richiesta.
      La prego di farci sapere che cosa il Asin o il numero di parte della voce che hai comprato?
      Abbiamo bisogno di conoscere maggiori dettagli circa l’articolo, in modo che si possa trovare una soluzione per voi.
      La prego di inviarci una foto e fateci controlliamo i dettagli e la connessione.
      Si prega di inviare tutte le informazioni per service@droking.com.
      Apprezziamo il vostro aiuto.
      I migliori saluti

      Dear friend,
      Thanks for your inquiry.
      Could you please let us know what the Asin or part number of the item you bought?
      We need to know more details about the item, so that we can find a solution for you.
      Could you please send us a picture and let us check the details and your connection.
      Please send all the information to service@droking.com.
      Appreciate your help.
      Best regards

  8. Digital AC/DC Multimeter 4 Data Display Voltage Current Power Energy – DROK February 16, 2016 at 6:18 am - Reply

    […] DROK DC Voltmeter Ammeter Dual Display […]

  9. Chris March 9, 2016 at 2:24 pm - Reply

    How do the ammeters and dual voltmeter/ammeters handle over-current at the shunt?

    • Drok March 10, 2016 at 2:34 am - Reply

      Hello Chris,
      The shunt is just a resistance with small resistance value which cannot protect the meter from being damaged by over-current.
      Over-current will burn the meter.
      Hope this can help you.
      Best regards

  10. Matt March 20, 2016 at 9:22 pm - Reply

    I would need a meter, that can measure 0-30V and 0-200A (CT or shunt, LED or LCD), but i can not find one in the german Amazon store. (only 0-100A).
    Where can i buy a 200A version?

    Thanks!

  11. Ammeter - Where to Wire It In? March 20, 2016 at 11:42 pm - Reply

    […] Auto/Car/Eletronic Voltage Meter with Transformer (200A): Automotive Here is DROK's website. DROK DC Voltmeter Ammeter Dual Display – DROK It seems a bit sketchy, and a several of the reviews are less than complimentary, but hey, Gordo […]

    • Drok March 22, 2016 at 2:26 am - Reply

      Hello,
      Could you tell us what can we do for you?
      Thanks

      • Noel Madding August 3, 2016 at 3:28 am - Reply

        I’ve been looking at your products and was wondering if you have a product that will work for me. I’m trying to assemble a tester to check out light and electric brake circuits for small 1 and 2 axle, 5000 -20,000 lb GVWR trailers that are pulled behind pickup trucks. Light circuits are no problem figuring out, but I’m wanting to test the ampere draw/load on the brake magnets, which are about 2.5-3.5 amps each , with 2 axles @ 4 wheels ends total would be 10 -14 amps total draw/load on the brake circuit at the trailer connection to tow vehicle. I was wondering if the shunts that are shown with your 0-30 Volt, 0 -100 Amp units can handle that much amperage.? I understand how the meters will measure volt and ampere differences so it can be displayed on the units, but I wanted to make sure that the amperage won’t try to feed thru the meter units and burn them up if the shunt can’t handle the amp load put to it. Thank you for enlightening me to your products and maybe will be doing business with you .

        • Drok August 4, 2016 at 1:55 am - Reply

          Hello Noel Madding,
          Thank you for your interest in our product.
          Here is a recommendation for you:
          Part number: #100384
          DROK® Micro Voltmeter Current Meter 12V/24V Digital Voltmeter Gauge 4.5-30V/100A DC Current Meter LED Display Auto/Car/Eletronic Voltage Meter with Transformer (100A)
          Parameter:
          Wiring hole diameter: 8.5 mm
          Transformer dimension : L23.3*W23*T9.3mm
          Testing range: 0.00–99.9V
          Resolution: 0.01(less than 10V); 0.1V(10V-100V)
          Resistance: > 100K
          Power supply voltage: 4–30V(Note: the max voltage input should not be larger than 30V, or it will burn out)
          Working current: <30mA
          Display color: red+blue
          Testing rate: ≥500mS/per time
          Measuring accuracy: 1%(+/-2 words)

          Extreme working conditions:
          Lowest power supply voltage: +4.0V
          Max power supply voltage: +30V
          Working temperature: -10 to 65 Celsius
          Operating humidity: 10 to 80%(No condensation)
          Working pressure: 80 to 106kPa
          Direct sunshine: NO(please prevent direct sunshine)

          Hope this can help you.
          Best regards

  12. D Jones March 25, 2016 at 7:02 pm - Reply

    I have installed your 33v, 4 digit 3 amp panel meter and it works very well. I thought I had seen a review that talked about calibrating the meter by use of a button on the back. My meter has a small red button on the back. How does this work ?

    • Drok March 28, 2016 at 1:24 am - Reply

      Hello D Jones，
      Thank you for your purchasing.
      Could you please tell us the ASIN or the link of the product?
      With your help, we can find a solution more quickly.
      Thanks

  13. mados123 April 8, 2016 at 7:05 pm - Reply

    I just purchased this from Amazon and it did not include the shunt, as shown in the pictures. What should I do?
    http://www.amazon.com/Multimeter-Voltmeter-DC0-199-9V-0-100-0A-Chargers/dp/B015PQ77N6

    I would also like this one but am unsure it will come with the shunt. Please advise.
    http://www.amazon.com/Multimeter-Voltmeter-DC0-19-99V-Chargers-Electric/dp/B015PQ795M

    • Drok April 10, 2016 at 1:49 am - Reply

      Hello mados123,
      Thank you for writing in and purchasing.
      Sorry for any inconvenience caused on you.
      Could you please send us an email(service at droking dot com) to tell us your order ID and the FNSKU which is marked on the label attached on the package?
      With your help, we can ensure if the product is wrong packed or wrong sent and find a solution for you.
      The second one will come with the shunt.
      Beg your forgiveness and understanding.
      Best regards

    • Kaylin January 8, 2017 at 5:39 am - Reply

      I got frustrated with my Samsung Chromebook freezing all of the time so I switched it back to &qeal;stobtu". Hasn't frozen once since reverting. Freeze issue appears to be a known problem the devs are working on.You can revert to stable via the USB stick recovery method. It is really simple but I wish there was an easier way to do it.

  14. Karl April 18, 2016 at 7:10 pm - Reply

    Hello! I recently purchased your multimeter panel (ASIN B00H0BTWHY) at the german amazon store and it works very well. But I would like to know, if it is possible to show the current in milliamps instead of amps, since I am mostly working with very low signal power. Can you give me a suggestion?

    Thanks in advance!

    • Drok April 19, 2016 at 1:46 am - Reply

      Hello Karl,
      Thank you for writing in.
      Sorry that the product(ASIN B00H0BTWHY) you purchased cannot be set to show the current in milliamps.
      Here is a recommendation for you:
      DROK&reg: Digital Voltmeter / Amperemeter DC 0-33V / 0-3A 12V 0,28 “Dual Display Spannung Strom-Monitor Volt Amp Measure Tester

      Technische Parameter:
      Displayfarbe : Rot + Grün
      Anzeigemodus : Dual 0,28 “-LED 4-Bit- Digital- Rohr
      Bildwiederholfrequenz: Über 200 ms / Zeit
      Seile in abweichenden Abmessungen : 48 x 29 x 26 mm
      Schnittgröße : 45 x 26 mm
      Versorgungsspannung: DC 3,5 – 28V
      Anschlusskabellänge : 14 cm (5- adrig)
      Messbereich: DC 0 – 999,9mA – 3,000A , 0.00 – 33,00V
      Betriebstemperatur: -10 – 65℃
      Messgenauigkeit: ± ( 0,3 % + 2 Stellen)

      Bildbeschreibung :
      Spannungsmessbereich :0.00 -33 .00 V; die minimale Auflösung beträgt 10 mV
      Strommessbereich : 0 – 999.9mA – 3.000A , wenn der Messstrom unter 1A, sie anzuzeigen **** mA, ist die resolusion 0,1 mA , wenn der Messstrom höher als 1A ist , sie anzuzeigen *** … * A ist die resolusion 1 mA ;

      Verdrahtung Anleitung:
      Rot ( VCC) : Leistungsaufnahme +, 3,5 – 28V ( . Hinweis: Wenn das Messsignal niedriger als 28V und haben reichlich Stromversorgung ist , kann es als Stromversorgung für das Messgerät schwarzen Draht und gelben Draht verwendet werden, werden miteinander in Kontakt zu verwenden)
      Schwarz (GND) : Leistungsaufnahme – , Mess- Signal –
      Gelb ( VIN) : Messsignal +
      Rot (I +) : Stromeingang + ( in Serie Stromversorgung Negative oder laden Negative)
      Schwarz (I- ): Aktuelle Eingangs (in Serie in Stromversorgung Negative oder laden Negative)

      Hope this can help you.
      Best regards

  15. R. Howe May 18, 2016 at 2:55 pm - Reply

    I have purchased the DROK DC Voltmeter Ammeter Dual Display, Part Number: 100153, UPC: 519397033008.

    Are the [Thick Black line (I-): Current Input -] and the [Thin Black line (GND): Power Supply – (DC 3.5-30V -), Measure Voltage – (DC 0-100V -)] a common ground?

    • Drok May 19, 2016 at 1:46 am - Reply

      Hi R. Howe,
      Thank you for writing in.
      Wire Connection:
      Thin Red line (VCC): Power Supply + (DC 3.5-30V +)
      (if the measure voltage between DC 3.5-30V, then the Thin Yellow line and Thin Red line can connect together)
      Thin Black line (GND): Power Supply – (DC 3.5-30V -), Measure Voltage – (DC 0-100V -)
      Thin Yellow line (VIN): Measure Voltage + (DC 0-100V +)
      Thick Red line (I+): Current Input + (Must be connected to the negative side of the load)
      Thick Black line (I-): Current Input – (Must be connected in series in the negative side of the power supply)
      The following pictures are the wring diagram for reference.
      Connection one is that the meter is powered by isolated power supply.
      Connection two is that the meter is powered from the circuit.
      Connection 1
      Connection 2
      Hope this can help you.
      Best regards

  16. Paul June 19, 2016 at 1:45 am - Reply

    I have a drok yb27va. Dc volt/ammeter with shunt for 100a dc. 3 wire connection. Can read voltage with it, but 0000 for current even with pots trimmed. Dig multi meter shows load of 2-30a dc. (When connected radio load used), yet straight zeros across board on DROK meter. Shunt is installed as per diagrams on your web site and forum pages. So…..whut’s up ?? No fluctuation on read out at all.

    • Drok June 20, 2016 at 1:28 am - Reply

      Hello Paul，
      Thank you for writing in.
      Sorry that we cannot ensure which product you have bought.
      Could you please tell us your order ID or the link of the product?
      With your help, we can find a solution more quickly.
      Best regards

  17. Chibuzor Okonkwo July 13, 2016 at 9:49 am - Reply

    Dear Sir,

    See attached and Kindly provide us with the quota {price, weight and delivery) for the item stated below.

    We would appreciate your prompt response to our request.

    1.

    DC Ammeter; Type: BP-670; Rating: DC1mA 300A;

    Manufacturer: KDSI
    Quantity needed -2

    Regards

    Chibuzor Okonkwo
    Procurement Unit
    Kamax Int. Corporate Ltd

    • Drok July 14, 2016 at 1:22 am - Reply

      Hello Chibuzor Okonkwo,
      Thank you for your interest in our product.
      Since many products are with similar titles and module number, it is hard for us to ensure the product you need.
      Could you please send us an email (service at droking dot com) to tell us the link of the product and where the product are shipped to?
      Looking forward to hearing from you.
      Best regards

  18. Chris Mitchell July 17, 2016 at 2:10 am - Reply

    What is the reason for no direct sunshine?

    • Drok July 17, 2016 at 2:28 am - Reply

      Hello Chris Mitchell,
      Thank you for writing in.
      Could you please tell us the link of the product you are referring to?
      Best regards

      • Chris Mitchell July 17, 2016 at 2:51 am - Reply

        o sorry, it’s this: https://www.amazon.ca/DROK-Voltmeter-Ammeter-Multimeter-Motocycle/dp/B00GLKQOKI/ref=cm_cd_al_qh_dp_t

        I’ve noticed that the power cycles on my circuit intermittently when this is connected (albeit it sometimes is in the sunshine)

        • Drok July 18, 2016 at 2:04 am - Reply

          Hello Chris Mitchell，
          All kind of LED products working under direct sunshine will become not clear, like you use your phone under the sun.
          This product is LED display, if apply it under direct sunshine, the display will become fuzzy.
          Sorry that we are not sure what does “the power cycles on my circuit intermittently when this is connected” mean.
          Could you please tell us more details of your problem and your operation, such as the input voltage/current, the load, the wiring, the working environment?
          It is better that you can send us some images to let us check the problem details.
          You can send us an email (service at droking dot com) with this information.
          Looking forward to hearing from you.
          Best regards

  19. new – DROK September 27, 2016 at 10:25 am - Reply

    […] DROK DC Voltmeter Ammeter Dual Display […]

    • Drok September 28, 2016 at 1:41 am - Reply

      Hello new – DROK,
      Thank you for writing in.
      What can we do for you?
      Best regards

  20. Wayne Garner October 24, 2016 at 3:20 pm - Reply

    Per your amazon post, I need an adjustable shunt for the 100V/A digital meter. Where do I find one for this? I installed this on a 75mv 200/V/A shunt and the amperage is incorrect.

    • Drok October 25, 2016 at 1:21 am - Reply

      Hello Wayne Garner,
      Thank you for writing in.
      The value of the shunt need to be matched with the measured range of the meter.
      Could you please tell us your order ID or the link of the product you have bought?
      With your help, we can find a solution more quickly.
      Best regards

  21. Ernie December 27, 2016 at 11:30 pm - Reply

    I have the 3.5 -30.0V, 50A 3 wire meter purchased from an eBay seller.
    I then bought a 50A/75mV shunt.
    Not a big investment in cash, but it sure took a long time to get here so I don’t want to burn it with incorrect wiring.
    I have a 7v,400mA power supply to use while I am setting it up, It will be used in a 19VDC circuit.
    So V+ (RED) to the shunt then on to the load, V- (BLACK) direct to the load.
    the red wire on the meter to the ++ side of the shunt the yellow wire to the + side of the shunt and black to power supply V-.
    YES?
    It indicated the voltage but no Amps.
    What am I doing wrong?

    • Drok December 28, 2016 at 1:23 am - Reply

      Hello Ernie,
      Thank you for writing in.
      Could you please send us the link of the product to let us ensure which product you have purchased?
      If you can, we sincerely hope that you can send us some images or video to let us check the problem details.
      With your help, we can find a solution more quickly.
      Best regards

  22. Dirk Schoenmaker March 7, 2017 at 2:45 am - Reply

    Hello,

    I have bought ASIN B00BYKRETK and I want to connect it to my RV batteries. I cannot really find the right wiring diagram. I have two batteries and to one of the batteries I have the power lines coming in and out. Don’t know which is what though. Hope you can help me out here.

    • Drok March 8, 2017 at 2:53 am - Reply

      hello Dirk Schoenmaker，
      Thank you for writing in.
      Here are two diagarm, hope they can help you.
      For more question, please feel free to contact us.
      Best regards.
      100014-1
      100014-2

  23. Khari June 22, 2017 at 5:45 pm - Reply

    Hello, I recently bought the DC0-199.9V Amp Meter 0-100.0A version from Amazon, part number 100418 and I don’t understand how the decimal placement of the Ammeter works. when I wired it up during testing, for 20ma it showed 20.0A and now it show 00.2A for 20mA wired the same way. How do I move the decimal to the original way it was displayed? And I am not using the shunt

    • Drok June 23, 2017 at 7:53 am - Reply

      Hello Khari,
      Thank you for writing in.
      The measuring result can’t be changed artificially.
      And this meter must be used with shunt. Would you please try to test it again?
      Best regards.

      • Khari June 24, 2017 at 8:45 pm - Reply

        I tried with the shunt and now the readings are completely wrong. I have the shunt wired in series with the load on the negative rail. How is the shunt supposed to be wired?

        • Drok June 26, 2017 at 3:59 am - Reply

          Hello Khari,
          To find out the problem origin, would you please kindly take some pictures to show the whole wiring?
          You can upload them here or send them to service#droking dot com ( please replace # with @).
          Look forward to your reply.
          Best regards.

  24. Bruce Singer November 9, 2017 at 2:31 am - Reply

    I purchased 2 DROK 0.28″ DC 0-100V 10A Digital {https://www.amazon.com/gp/product/B00EXCUHJU/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1} from Amazon to monitor the current flowing from my solar panel’s charge controller to the battery. I connected the meter per the connection 1 Figure on Amazon’s web site.

    The Voltage meter reads with in .01 of my meter. However, the Amp meter always reads 0. Not only is it not measuring the current, it is not allowing any current to flow and my solar panel is not charging my battery. What is wrong. Does this meter have reverse current protection?

    • Drok November 9, 2017 at 8:31 am - Reply

      Hi Bruce Singer,
      Thanks for writing in.
      Did you follow this diagram?
      100153
      To check what wrong is, is it convenient for you to take some pictures about your wiring?
      Best regards.

      • Bruce Singer November 10, 2017 at 2:47 am - Reply

        Yes, except that there is no Thick Yellow Line. I used the thin Yellow line form the 3 wire connector.

        Does this meter have reverse current protection?

        • Drok November 13, 2017 at 2:27 am - Reply

          Hello Bruce Singer,
          This meter doesn’t have reverse current protection.
          May I know more details about your wiring. Is it convenient for you to take some pictures or a video about the wiring and operation? We will show it to our technicians.
          With more information, we can find out problem more quickly.
          If it’s hard to upload picture or video here, please kindly try to send it to our sevice email. (service@droking.com)
          Best regards.

  25. Phil C December 9, 2017 at 2:05 pm - Reply

    Hi, I have the Volt/Amp 0-33v & 0-3A meter, PN 300007
    https://www.amazon.com/DROK-Digital-0-33-00V-0-3-000A-Measurement/dp/B00IZU4D4Q/ref=cm_cr_arp_d_product_top?ie=UTF8

    I cannot easily isolate the load ground on my design. All the wiring diagrams show I+/I- are inserted on the ground side of the load. Can the Amp meter (I+/I-) be inserted on the positive side of the load?
    If yes, should I+ be connected to power supply positive, and I- be connected to the load positive?
    Please promptly reply.
    Comprehensive diagrams and application notes should be posted on your site, so we don’t have to keep asking.

    Thanks
    Phil C

    • Drok December 11, 2017 at 6:52 am - Reply

      Hello Phil C,
      As it was weekend, we are sorry for delayed responsed.
      RED(I+) must be connected to load negative. It can’t be moved to load positive. And the Black(I-) is connected to power supply negative.
      Best regards.

  26. Jackers March 23, 2018 at 8:50 pm - Reply

    Hi I have a 100 a version of your meter, and it is showing 342,22Amps, no mater what load I have connected.

    Voltage reads correct and within 3% of voltage, but the current dose not change.

    • Drok March 26, 2018 at 9:46 am - Reply

      Dear Jackers,
      We are sorry to hear that.
      Would you please firstly send us the product link or ASIN number so that we can confirm the item you mean?
      Best regards.

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