electrolight Red LED Display Mini 0.36 inch 3 wire DC 0-100V Digital Voltmeter. Voltmeter  (Digital)

This voltmeter uses 0.36inch LED digital tube without casing. The voltmeter is small shape and stable performances. It can display well. This voltmeter's measurement range is wide, it's DC0-100V. It need outer working power supply and the voltage is DC4.0-40V. There is protection when the wires aren't correctly connected.This voltmeter is suitable for clients who has DC power supply, because this can save cost. And it can be used when the voltage need to be measured from 0V.This voltmeter's measurement range is 0-100V, this voltage is just measurement signal and it can't be regarded as voltmeter's working power supply. This voltmeter need outer working power supply which can supply DC4.0-40V as working power supply. About three wires, the black wire is communal negative pole,he white wire is connected to measuring voltage's positive pole, the red wire is connect to working power supply's positive pole,the measuring circuit and power circuit's negative pole are communal.