It is a Digital Ammeter/Amperemeter/Tester, Measuring Current Range: 0~49.9A, Power Supply Voltage: DC 6~24V, Build-with connection reverse protection, 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 Current Measuring.