Specification 1.accuracy: 1 percent 2 words 2.Measuring range: AC Voltage: AC 80.0-300.0V or AC 200.0-450.0V AC Current: AC 0-100.0A, the current resolution is 0.01A. Frequency: 45.0Hz Power factor: 0,00-1,00PF Electrical power: 0-450000W, the resolution of electrical power is 0.1W when the electrical power is measured between 0-9999.9W, otherwise the resolution of electrical power is 1W. Electrical 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 greater than 9999.9kwh 3. Measuring speed: about two times per second 4. Dimensions: 54mm80mm64mm 5. Installation method: Rail type Property Use and wiring method: 1. Connect the measured voltage to terminals 1 and 2 at the bottom left of the meter. 2.The built-in transformer is wired according to the schematic in Figure 1, and the wire of the measuring loop is passed through the round hole under the meter. The direction of wire entry can be chosen by the user according to the application situation, and it can be penetrated upwards by the circular opening under the meter. The wire can also escape from the circular hole at the top of the meter, whereby the different penetration directions do not affect the measurement results. 3. Connections of the meter with external current converter as shown in Figure 2. Pass the wire through the hole in the meter and connect the two wires of the secondary converter to the terminals 3 and 4. 4.The meter displays the measurement parameters after switching on. 5.If it is necessary to reset the electrical energy measurement (when measuring zero), press the button (RESET) on the right side of the instrument panel and hold it for five seconds until the electrical energy indicates 0, release the button. The electrical energy has the function of automatic data storage after a power failure, i.e. when the measuring voltage is interrupted or a power failure occurs, the meter automatically stores the current test data, and when the measuring voltage is reconnected, the meter continues to accumulate the previously stored data. Attention: The measuring voltage range of this meter is 200-450V and is only suitable for pure AC 45-65Hz mains power supply, and the measuring range is 40-300V without restriction. The meter can only be used for measuring 45-65Hz AC city current. Package included: 1xDin Rail Single Phase Digital Voltage Current Power Meter