DROK 0.56" Red LED Panel Digital Amp Ammeter DC 0-99.9A Automotive Amperemeter Current Tester Ampere Meter Gauge + 100A / 75MV Current Shunt DC 0-99.9A measuring range; DC 7-30V power source, with reverse polarity protection (1% +2 digits) measurement accuracy, with precision calibration adjustment 48x29x21mm dimensions, 45.5x 26.5 Cutting size, easy to mount 0.56" Digital Tube with clarity and brightness LED display With 100A / 75mV shunt, easy to connect