... -wire, single-phase mode 3) V, A, W, VA, VAR, KWh, PF, Hz measurement 4) Double display two parameters on eash menu ... ) Over-range display: “OL” 6) Data holding: “HOLD” is shown on LCD 7) Power supply: 4 batteries of 1.5 V ... + graduation #) ambient temperature: 18°C ~ 28°C, Humidity 80%, frequency for voltage, current: 45 Hz ~ 65 Hz Three Phase Digital Power Clamp Meter