DROK Digital Voltage Current Tester Voltmeter Ammeter Multimeter DC 0-100V/50A Volt Amp 2in1 Volt Ampere Panel Meter Red/Red LED Display Amperage VA Gauge Monitor It is compact in size and light in weight and it could display voltage and current in the same time Its tested terminal shares same ground wire with the power supply terminal There are voltage and current potentiometers in the back side of our meter for accuracy adjustment It adopts wide power supply range of DC4.5 to 30V and will not burn even wires connected reversely Its decimal point of voltage meter will automatically move