... phase 3-wire, 3-phase 4-wire, single-phase mode 3) V, A, W, VA, VAR, KWh, PF, Hz measurement 4) Double ... power value and five power parameters of each phase in 3-phase measurement mode respectively 6) Autorange and TRMS ... select tested signal be power supply for the clamp at one time, the instrument can measurement for ... frequency for voltage, current: 45 Hz ~ 65 Hz Three Phase Digital Power Clamp Meter