It is a Digital Voltmeter/Voltage Monitor/Digital Meter/Tester, Measuring Voltage Range: DC 0~33V, Power Supply 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.