... power We can provide meter ,voltmeter,ammter,power meter,domestic electric meterskwh panel meter.......Shape and hole cutout dimension Unit : ... .5Protection IP65, ABS Plastic shellShort-depth dimension, instal to the Electric Power Cabinet easilyCan measure current, voltage, frequency, power factor, ... 50V 100V 220V 380VFreq:44-55Hz 45-66Hz 55-65Hz 47-53Hz 57-63Hz 44-56Hz 54-66Hz 450-550Hz 550 ...