... ) To measure: Voltage, Current, Active Power, Reactive Power, Power Factor, Frequency (Hz), Kwh, 4 Quadrant Energy, etc. Total 28 electrical parameters;2) ... . 10 years back-up of integrated energy data5. Large LCD, high brightness, auto-scrolling6. High accuracy, V or I is 0 ... Active / Reactive / Apparent power, accuracy 0.5%F.S.Energy Accuracy for Active Power and Reactive Power : 1%F.S.DisplayLCD ...