Quick Overview

Usb charger doctor voltage current meter mobile battery tester power detector display data: Voltage current input unsorts, reset button, press it three seconds will reset out usb voltage: 4v-20v ( 1 percent accuracy ) current: 0-3a ( accuracy of 0. 4 percent ) battery capacity (0-99999mah)working time (0-99hour) the working time and capacity have memory function when power off.