This voltmeter can be used to measure the storage s in motorcycles and and also can grasp the storage s It also can be used to measure other There is when the wires t correctly the electric circuit t be bumed To reach the best measurement accuracy , this voltmeter will automatically the decimal point ' s position according to the different measuring When it measures the below it will display two after decimal point When it measures the it will display place after decimal point This voltmeter ' s wiring is simple , it only need to two wires is to to positive utmost ， the black wire is to to utmost This voltmeter doesn ' t need external working power ， it can work with measuring the working is 4.5-30V, Manufacturer: Watreketal