DROK 0.56" Ampere Panel Ammeters DC 100A Digital Electric Current Amp Meter Tester 0-99.9A Blue LED Display DC 0-99.9A measuring range; DC 7-30V power source 4 wires connection (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 no current shunt, please add a 75mV/100A Shunt