... Energy Meter single&3 phase RMS measurement for volt,amp,power.frequency,power factor,reactive power,etc. 2011--Industrial Energy Meter, digital Watt Meter ... S±2 digit Alarm OutputRelay/SSR output for any power parametersSampling Speed<0.2s Communicaiton ... RTD), Panel Meter, Sensor Meter, inductor, Power Meter, Coulometer, Voltage Meter, Ampere Meter, Counter, Tacho Meter, Frequency Meter, flowmeter, ...