Features High precision 4 digitWorking voltage DC 4V 28VWorking current 20mADisplay 0 28 Red Blue Dual LED DisplayVoltage Measuring Range DC 0 000V 100 0VCurrent Measuring Range 0 9 999ARefresh rate about 1S 3timesOperating temperature 10C 65CWorking pressure 80 to 106 kPaSize 48x29x20 mmMounting hole 46 x 27 mmCurrent Range x 0 08 Two decimal pointVoltage Range x 0 08 Two decimal point Wiring Red line thin power supply Red line thick IN current inputYellow line thick PW measuring terminal voltage input positivBlack line thick COM common measuring Note Please follow the wiring diagram special attention the load can only be connected to the positive not negative Otherwise burn the table Package Included 5 x DC 100V 10A 0 28 Inch Mini Digital Voltmeter Ammeter