1.Accuracy: 1%±2 words 2. Range: AC voltage: AC 40.0-300.0V AC Current:AC 0-100.0A, the current resolution is 0.01A. Frequence: 45.0Hz-65.0Hz Power 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: plastic Color as shown Electric Energy: 0-99999kwh, the display of electric energy resolution is 0.01kwh when measure electric engery 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 9999.9kwh Speed: 2 times per second Installation: Din-Rail Application Method 1. Connect the measure voltage to the l and 2 terminal 2. 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 the button of last for 5 seconds, then the electric energy to be zero and start 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 next. Package Contents: 1 x Din Rail Digital Voltmeter(AC 40-300V External CT) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.