It is a Digital Meter/Tester/Panel Meter. Working Power supply: DC 4~30V(Independently powered). Measurement Voltage Range: DC 0~100V. Display mode: Three 0.36 LED digital tube. Applications: Suitable for 36V/48V/60V/72V electric vehicles and Charger,Auto, inverter, solar energy, LED lights or other industrial equipments, electronic equipment, Communications Equipment, etc.