It can monitor complete power quality parameter information and provide key data 1.Main circuit measurement parameters include but are not limited to three phase voltage, current, frequency, active power, reactive power, power factor, active electric energy, reactive electric energy, zero ground voltage, neutral line current, total harmonic content (THD), 2nd-63rd harmonic, current voltage unbalance, current K factor (KF), voltage crest factor (CF), telephone waveform factor (thff), peak voltage, voltage and current sequence, ambient temperature and humidity. 2.Branch measurement parameters include but are not limited to voltage, current, frequency, active power, reactive power, power factor, active electric energy, reactive electric energy, 2-31 harmonics