It is a 2in1 Digital Meter/Digital Voltmeter Ammeter/Tester, Measuring Voltage Range: DC 4~30.0V (Can Measure Power Supply Directly), Measuring Current Range: 0~2.00A, Application: industrial equipments,electronic equipment, Power distribution box, distribution cabinet, regulators, teaching aids, household small distribution box, Storage Battery Car and All kinds Voltage Current Measuring.