ZDELT USB Voltmeter

KWS-V20Size: Length 59mm (with USB7 3mm) *Width 23mm*Height 13.5mmVoltage: input/output voltage: 3-9V, voltage resolution: 0. 01VCurrent: input/output current: 0-3A, current resolution: 0.01AAccuracy: plus or minus 1 loss: about 0.1 ohmWeight: 20gIntroductionIN-input terminal is connected to output port chargerRTZ-clear key, screen display will be cleared after 3-5 secondsOUT- USB port where output terminal is connected to data lineInput voltage display window (3-9V) accuracy +-1%Charging current display window (0-3A) accuracy +1%Battery capacity display window (0-99999mAh)Working time display window (0-99H) in minutesWorking time and empty capacity display after power off, memory function KWS-V21Size: length 59mm (with USB7 3mm) * width 23m * height 13. SmVoltage: input/output voltage: 4-20V, voltage resolution: 0. 01VCurrent: input/output current: 0-3A, current resolution: 0. 01AAccuracy: plus or minus 1 loss: about 0.1 ohmWeight: 20gIntroductionIN-input terminal is connected to output port chargerRESET- reset button, screen display will be reset after 3-5 secondsOUT- USB port where output terminal is connected to data lineInput voltage display window (4-20V) accuracy +-1%Charging current display window (0-3A) Accuracy +-1%Battery capacity display window (0-99999mAh)Working time display window (0-99H) in minutesWorking time and empty capacity display after power off, memory function package includes:1*Voltmeter