... Industrial Energy Meter single&3 phase RMS measurement for volt,amp,power.frequency,power factor,reactive power,etc. 2011--Industrial ... Energy Meter, digital Watt Meter(Wattmeter) Features: Power Supply80-260V AC/DC or ... (24V DC)Measure ParametersRMS measurement, 1/3 phase volt,amp,power,power factor,frequency,KWH,reactive powerAppearance48H*96W*100Lmm, ...