If you've ever been curious about the voltage at a USB socket, or the amount of current drawn by a device - then call the Charger Doctor into action. Simply plug him/her/it into a USB socket and the device in question into the Charger Doctor. The LED display will then alternate between the voltage and the current every fews seconds. It's as simple as that. We also have a more compact version built into a USB cable.
The Charger Doctor has a voltage range of 3.5 to 7V DC, and a current range of 0 to 3 A - with resolutions of 0.1 V and 10 mA. Check it out in the following video: