Specifications: 1) Precision levels: 0.5W grade, 0.55W grade, 1W grade, 0W: 2 grades 2) Data preservation time in case of battery loss: >=6 hours 3) Data preservation time: 10 years 4) Extreme operating temperature: -30oC to 55oC 5) Real time measurement: flow, voltage, frequency and power (with current) 6) Watt measurement: a) Separate time measurements b) Able to measure wattage even without flow in the positive direction, negative direction and in four phases 7) Demand accounting: four demand accounting rates, four time zones, 10-day periods, automatic switch in 100 years (1996-2095) Inner packing: Dimensions: 289 x 170 x 96mm Weight: 3,833g