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 ... : 086-13217608016(Barbara Guo) 086-13435730867(Peter Liao) 2011--Industrial Energy Meter, digital Watt Meter(Wattmeter)