Features: Measurement accuracy: 1%2 wordsMeasuring ranges: ACvoltage: AC40.0-300.0V, (orAC250.0-450.0V), users can choose a suitable measuring ranges when ordering) Accurrent: AC0100.0A, and current display resolution is 0.01APower frequency: 45.0Hz-65.0HzPower factor: 0.00-1.00PF Active power: the measuring ranges is 0-45000W, the display resolution between 0-9999.9Wis 0.1W, and the rest is1W Electric energy: the measuring ranges is0-99999kwh, and the minimum display resolution of 0-999.99kwh is 0.01kwh.The minimum display resolution of 1000.0-9999.9kwh is 0.1kwh.The minimum resolution of 10000-99999kwh is 1kwh Measuring speed: about 2 times per secondOverall dimensions: 54x80x64mm/2.12x3.14x2.51inchInstallation method: guide rail type Specifications: Material:Plastic Size: Approx.5.4x8x6.4cm/2.12x3.14x2.51inch Measuring range: AC-voltage: AC40.0-300.0V, (or AC250-450V). Ac-current: AC0100.0A, and current display resolution is 0.01A Power frequency: 45.0Hz-65.0Hz Power factor: 0.00-1.00PF The minimum display resolution of 1000-9999.9kwh is 0.1kwh. The minimum resolution of 10000-99999kwh is 1kwh. Measuring speed: about 2-times per second Note: Usage and wiring methods 1. Connect the measured voltage to terminals 1 and 2 at the lower left of the instrument. 2. The built-in transformeris wiredaccording to the wiring diagramin Figure 1, and the lead of the measuring circuit passesthrough the round hole belowthe instrument. The user can choose the direction of the lead according to the use situation, and it can pass through the round hole belowthe instrument or pass through the round hole above the instrument, and the measurement result will not be affected if the direction is different. 3. Connect the external transformeraccording to the wiring diagramin Figure 2. Connectthe two wires of the secondary end of the precisions current transformerwith the instrument to the terminals 3 and 4 at the upper left of the instrument respectively, and pass thewires of the measuring circuit through thecircular hole of thetransformer. 4. The measured parameters displayed by the instrument after the power supply isconnected. 5. When it is necessary to reset the electric energy measurement (when measuring fromzeros), press and hold the button (reset) on the right side of the instrument panel for 5 seconds (hold and hold for 5 seconds) until the electric energy shows 0, release the button, and then the electric energy will be measured fromzeros. Electric energy has the function of automatically saving data in case of power failure, that is, when the measuring voltage is disconnected or power failure, the instrument will automatically savethe data currentlytested, and when the measuring power supply is reconnected, the instrument will continue to accumulate on the originalsaved data. Package includes: 1x Current Power Meter