Working Voltage from 30V to 400V Working Current <100mA Display Formats 0.56 red LED Dimensions 74*26*41mm Weight about 0.042kg * Standard Size and Specification * The Core is 10 A / D converter microcontroller, high accuracy, wide measuring range (30V ~ 400V) * get Power directly from the testing , and only need 2 wires can work normally and it is able to access accurate testing,no need match ...