1PCS USB Charger Tester Voltmeter Ammeter Current Voltage Tester KWS-V20/V21 LCD Digital Display Power Battery Capacity Detector

Product Name: KWS-V21 Mobile Power Test and Detector Voltage: Input/Output Voltage: 4-20V; Voltage Resolution: 0.01V Current: Input/output current: 0-3A, current resolution: 0.01A Accuracy: ± 1% Line loss: around 0.1 ohms IN - Input terminal connected to the output port of the charger RESET - reset button, press for 3-5 seconds and the screen will display reset 0UT - USB port connected to data cable at output end, input voltage display window (4-20V) accuracy+-1% Charging current display window (0-3A) accuracy+-1% Battery capacity display window (0-9999mAh) Working time display window (0-99H) Unit minute The working time and empty space display have memory function after power failure