This voltmeter's wiring is simple,it only need to connect two wires,There is protection when the wires aren't correctly connected,the electric circuit won't be bumed.This voltmeter doesn't need external drive working power,it can work with measuring voltage,Very wide input range.To reach the best measurement accuracy,this voltmeter will automatically move the decimal point's position according to the different measuring voltage.DC voltmeter can be used to measure the storage battery's voltage in motorcycles and cars and also can grasp the storage battery's status. It also can be used to measure other voltage.

1.)Please attention to the voltmeter's maximum operating limited voltage,please leave enough margin when working,to avoid voltmeter's permanent damage because of electrical spark ,power supply ripple,or other too high abrupt change of voltage.

2.)This voltmeter didn't do moisture-proof,waterproof,shockproof,anti-oil processing,please be careful or handle by yourself when using.

Measuring Range :DC4.5-30V, DC4.5-120V,AC30-500V(optional)