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This tester can be a USB current, voltage and capacity meter that can store 10 consumption history log. It can be helpful to find a digital device charging problem.Specifications:Dimension 60×28.5x5mm (cablelength15 cm)Input Voltage: 3V 7V Input current: <3.4A Parameters that you can test: Voltage of battery. Current of battery, value of discharging capacitor. (Total ten records)Click the button once to go forward and switch between channels, double click to go back to previous channel.Keep the button pressed to restart de channel