The current DIN Din Voltage amperemetre is used to measure voltage and alternating current, and calculate the active power, the reactive power and the power factor at the same time. It works by driving the wire through the hole, especially to check the devices at all , thus ensuring safety. Display voltage, current and power simultaneously through the digital LED tube. DIN rail installation and easy measurement, just connect to power and direct the wire through the hole. Wide voltage and current measurement range. Compatible with all , allowing you to monitor their electrical condition at real time. Help to remind you to shut down appliances, preventing safety problems and saving electricity. Easy to install on a DIN rail. High precision, easy to use. Made of high quality ABS materials, it is safe, and durable. Material: ABS color: White Precision: 1%, +/- 2 words Displayer: AC and AC voltage with 4-digital 0.31 inch LED; Active power, power and reactive power factor with 5-digital 0.31 inch LED Measuring range: AC voltage 200-450V; 0-100.0A alternating current; active power: alternating voltage 80.0-300.0V: 0-30000W; reactive power: 80.0-300.0V: 0-30000VA; power factor: 1,000 to 0,000 Measuring speed: about 2 per second Mounting width: = 3P (DZ47 / C45, air switch position) Installation Path: DIN rail (DIN rail universal step, not included) Size: 8 * 5.4 * 6.4cm / 3.15 * 2.13 * 2.52 inch Package Contents: 1 * ammeter power meter voltmeter 1 * Manual (English) Only the above package content, other products are not included. Note: Light 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.