It is a Digital Meter/2in1 Voltmeter Ammeter/Panel Meter Tester, Power Supply: AC220V +/- 10%,Measure Voltage Range DC 0~19.99V,Measure Current Range 0~50.00(needn't external shunt,measure directly), Suitable for Sine wave inverter, solar wind generator, LED lights measure automotive/electric cars/motorcycles battery monitoring or other products voltage current measurement.