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This handy USB voltage and current (amperage) meter is easy to use, simply plug the tester between the USB port and the device you would like to test, and the voltage and current will be displayed on the tester's LED display. (The display alternates between voltage and current.) This tester is ideal for testing the functionality of all of the old USB power supplies you have accumulated.

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Compact and easy to carry, no additional power supply and other ancillary equipment, Plug and Play; The tester USB Charger doctor can easily measure the output voltage of the USB port and the device. The tester uses a new generation of power four and a half double integral cycle conversion IC, with a precision bandgap reference, range accuracy, high precision, stable and reliable performance, strong anti-interference ability.