... .Features of DW9 three phase digital power meter : - Multi-function coulo-meter. - Measuring object: voltage, current, power, power consumption, power factor, frequency, active ... (between terminal points and plastic case)Withstand voltage100 M ohm (DC 500V,between terminal points and plastic case)Ambient temperature0~50 ... CO.LTD With or Without Analog Output , DW9 Three Phase Series Digital Power Meter