1. When the instrument is first powered, it needs a minute stabilized to normal measurement.2. This instrument only applies to pure AC 50Hz mains power supply. 1. Accuracy: 1%2 digit.2.Display Mode: AC voltage and power factor use four red led of 0.31-inch AC current and electric energy of cumulative time use five red led of 0.31-inch Active power, electric energy use five green led of 0.31-inch3.Range: AC voltage : AC 80.0-300.0V AC 0.0-100.0A ( when measure signal lower than 100A, the accuracy is 0.01A, when measure signal higher than 100A, the accuracy is 0.1A, the accuracy can auto-change) Active power: 0.0-30000W Electric energy: 0.000-99999kwh Electric energy of cumulative time: 0.00 - 999.59h Power factor: 1.000-0.0004.Speed: 2 times per second5.Size: 72*63*87mm6.Installation: Din-RailDesign Patent No: 201430231062.4