... V CAT2) Power measurement of 3-phase 3-wire, 3-phase 4-wire, single-phase mode 3) V, A, W, VA, VAR, KWh, PF ... frequency so as to assure the reading stability) 5) Over-range display: “OL” 6) Data holding: “HOLD” is shown on LCD 7 ... : ±(% read + graduation #) ambient temperature: 18°C ~ 28°C, Humidity 80%, frequency for voltage, current: 45 Hz ~ 65 Hz Three Phase Digital Power Clamp Meter