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Feature: This product can test USB charging current, voltage, discharge capacity,intelligent devices. It will show the current and voltage at the same time, convenient to check. It can be very easy to find digital devices charging problem. The only button on the tester is used to view and test data switch, the tester can store 10 groups of test data. If there were no battery, it won’t lose the data it has tested. It can test current and voltage of phone, mobile power bank etc. With a USB output port and a micro USB input, convenient to test devices With LCD screen, easy to see the current and voltage of the devices Press the small circle button and the data will be zero, then you can test next data Portable design, easy to carry Input Voltage: 3 - 7V Input Current: 50mA - 3500mA Capacity: 0 - 19999mAh LCD show voltage and current simultaneously Save data each time power off High precise current calibration function High and low voltage alarm Model: KCX - 017 Design: Professional Feature: Portable Function: Text Current and Voltage Interface: USB2.0 Product Size (L x W x H): 6 x 2.8 x 1.5 cm / 2.36 x 1.10 x 0.59 inches Package Contents: 1 x Current Voltage Meter