DROK Mini Digital Amp Ampere meter Two Wires 0.56" 0-50A DC Ampere Testing Meter Green LED Panel Display+Current Shunt For Ammeter Measurement range: DC 0-50 0A Power supply: DC 7-30v, 2 wires Display: three 0 56 inch Display color: Green Accuracy: 1 percent (+/- 2 digit) (measuring 75mV)