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USB Current Voltage Meter Battery Tester measures and displays current and voltage simultaneously. USB Current Voltage Meter Battery Tester is also known as USB Doctor. This can easily measure the operating current of the output voltage of the USB port and equipment 2. This current power meter is a small size, no power, and other ancillary equipment, plug and play also detect USB charger output voltage and current are standardly suitable for charger testing, USB current tester, another measurement of USB voltage and currents.