The power meter is used to calculate the electricity ... current voltageV, currentA, frequencyHz,current power consumptionW, highest power consumptionHi W, lowest power consumptionLo W, total K.M. ... the total running timeeasy and conformable to useLow power consumptionOVERLOAD Function Technical parameter:Working voltage:AC90~250V ... version, Australia version and Danmark version. Professional Power Meter