15-in-1 multi-function measuring tool, can be used to measure voltage, current, power factor, power, electrical energy. 2The measurement resolution can change automatically. 3Voltage display, current display adopts 4-digit red 0.32 inch LED digital tube. 4Active power, electric energy (electricity) and power factor adopt 5-digit, green 0.32 inch LED digital tube. 5High measurement accuracy, up to 1% 2-digit. Item Type: Multi-Function Energy Meter Measurement Accuracy: 1% 2-digit Display: Voltage display, current display adopts 4-digit red 0.32 inch LED digital tube, active power, electric energy (electricity) and power factor adopt 5-digit, green 0.32 inch LED digital tube. Optional Voltage & Current: 80~300V 100A, 200~450V, 100A Measuring Range: AC Voltage: AC80.0-300.0V (or AC200.0-450.0V, users check according to need when ordering). Please select 80~300V voltage for 220V measuring; Please select 200-450V voltage for 380V measuring. 200-450V if for 220V voltage, when the voltage is lower than 200V the meter does not work. AC Current: AC0.00-100.0A, the display resolution is 0.01A when the measurement current is less than 100A, and the current display resolution is 0.1A when the measurement current is greater than 100A, the range is automatically converted. Active Power: (measuring voltage AC80.0-300.0V) 0.0-30000W (AC200.0-450.0V: 45000W) Electric Energy: 0.000-99999Kwh, automatic conversion of decimal point Power Factor: 1.000-0.000 Measuring Speed: About 2 times per second Use and Wiring Method: 1. According to the wiring diagram of the drawing, connect the secondary end (green lead) of the current transformer of the instrument to the blue terminal of the meter, and pass the wire of the measuring circuit once through the middle hole of the current transformer.2. Connect the lead of the voltage measurement to the green terminal of the meter. Then power on to measure the voltage. Start reading the measurement results. 3. After the power is turned on, the measurement display functions displayed by the meter are voltage (V), current (A), and active power (W). When you press the button on the left side of the instrument panel (SAM CK), the active power (W) display of the meter changes to display electric energy (electricity) (Kwh), and changes to the display power factor (COS) at the push of a button. Press the button to change and return to the display active power (W). Press the (SMA CK) button to display the display function of the digital tube. The following figure shows the cycle. 4. When it is necessary to measure the electric quantity (electric energy) from zero, press the button (SAM CK) to convert the measurement function to the electric quantity (electric energy) measurement function, which is the right function of the 5-digit green LED digital tube display on the meter display. The indicator light indicates the position of Kwh, then press and hold the (SAMCK) button for 5 seconds. The 5-digit green LED digital tube displayed by the electric energy (electricity) all displays zero, and the release button (SAM CK) power (electricity) ) shows the measurement from zero. 5.