... phase 3-wire, 3-phase 4-wire, single-phase mode 3) V, A, W, VA, VAR, KWh, PF, Hz measurement 4) Double display two ... value and five power parameters of each phase in 3-phase measurement mode respectively 6) Autorange and ... serious, it is better to use manual settings for testing frequency so as to assure the reading stability) ... for voltage, current: 45 Hz ~ 65 Hz Three Phase Digital Power Clamp Meter