1.Accuracy: 1%2 words2. Range: AC voltage: AC 40.0-300.0VAC Current:AC 0-100.0A, the current resolution is 0.01A.Frequence: 45.0Hz-65.0HzPower Factor: 0.00-1.00PF. Electric Power: 0-450000W, the electric power resolution is 0. 1W when measure electric power between 0-9999.9W, otherwise the electric power resolution is 1W.material: plasticColor as shownElectric Energy: 0-99999kwh, the display of electric energy resolution is 0.01kwh when measure electricengery between 0-999.99kwh, the display of electric energy resolution is 0.1kwh when measure electric engery between 1000.0-9999.9kwh and the display of electric energy resolution is 1kwh when measure electric engery larger than 9999.9kwhSpeed: 2 per secondInstallation: Din-RailApplication 1. Connect the measure voltage to the l and 2 terminal2. Connections of meter with internal current transformer as graph 1. Make the wire through the hole in the meter and the direction chose arbitrarily.3. Connections of meter with external current transformer as graph 2. Make the wire through the hole in the meter, and connect the two wires of the secondary transformer to the 3 and 4 terminal.4. When power on, the meter display the measure parameters.5. When power on, you can press the button of last for 5 seconds, then the electric energy will to be and to cumulate when release the button. And when power off, the meter can save the value ofelectric energy and go on cumulating data when the meter power-on .Package Contents:1 x Din Rail Digital Voltmeter(AC 40-300V External CT)Only the above package content, other are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.