It is a Voltmeter/Digital Voltage Meter/Panel Meter/Tester, Measuring Voltage Range: DC 0 ~100V ( three-wire access ), Operating Voltage: DC 7~30V, Application: industrial equipments,electronic equipment, Power distribution box, distribution cabinet, regulators, teaching aids, household small distribution box, Storage Battery Car,Motorcycle, Car, E-bike, ATV, Scooter, and All kinds Voltage Measuring.platforms.