Multi-function power analyzer meter: 1.LCD display 2.Cumulative power,harmonics measurement,events records 3.DI,DO. 4.CE. Multi-function Power ... characteristics,as well as functions of programmable ,automated measurement,LCD display ,cumulative power,harmonics measurement,events records(SOE), ... 4VAWorking Conditions Temp.:-15-55Humid: 20-95% (without condensation) Multi-function power analyzer meter