Hi there, We are a digital rental company and own 10 macs which we rent out to photographers/clients. Our computers are attached to pro cameras through the usb/thunderbolt ports of the computer. We sometimes have trouble with the ports not supplying enough power to tether to the camera and establish a connection. Will your ‘DROK® Mini USB Current Voltage Charger Detector’ allow us to test just the power coming from the usb ports themselves? If so, which product would you recommend would be best suited for our needs? Thanks, mark