Hello Chad,
Yes, this product can be applied without isolated power supply.
You can connect the power supply+ (red wire) and the measure+(yellow wire) to the positive side of the power supply and the black wire is connected to the negative side of the power supply.
Measure voltage: DC 0-30.000V
Power Supply: DC 5-30V
Hope this can help you.
Best regards
Thanks. I wired my meter the way you suggested. However, the meter will sometimes show 0.00. Then after a while will return to normal (12.7 V). It’s in a car to measure battery voltage.
Hello chad,
Thank you for writing in.
Could you please send us some images of your wiring to let us check the problem details?
You can send the images by email (service at droking dot com).
With your help, we can find a solution more quickly.
Best regards
Thanks for the help. The meter is working good now. I am curious if the voltage displayed is adjustable at all? The DROK volt meter reads slightly different than my multi-meter.
Hello Chad,
You’re welcome.
So sorry that this meter do not have voltage calibration potentiometer.
However, it is well-calibrated and we have tested our products before shipping to Amazon warehouse.
Hope you can understand.
Best regards
Chad
