Harmonic Power Clamp Meter FeaturesMeasuring Voltage,Current,Voltage/Current peak,effective/ ... ,frequency, phase detection(3-phase),voltage/current harmonic levels(up to 20th)and total harmonic distortion(THD-F and THD-R)TRMS ... .3capto 0.3ind±3°Frequency(Hz)45~ 1000Hz±0.5%Harmonic measurementFundamental frequency:50/60Hz±3%(Level of each orderWindows width ...