It is a Digital Voltmeter Ammeter/2in1 Digital Tester, Measure Voltage Range DC 0 ~ 100V,Measure Current Range 0 ~ 50A (require external shunt) , Accuracy: 1% +/- 1 digits ,It has small size, high efficiency, long term stable and reliable quality,easy installation and use . Applications:Suitable for Charger,Auto, Electric Bicycle,inverter, solar energy, LED lights or other products voltage current measurement.