Feature: 1. Full viewing angle colorful LCD screen, 178° wide viewing angle. Built‑in transformer, accurate measurement. 2. The instrument displays 6 parameters including AC voltage, AC current, active power, power factor, frequency and electric energy at the same time. 3. The electricity consumption of the whole house is clear at a glance, and the electricity consumption of the house can be monitored at any time. 4. Applicable to the chemical industry, power plant, automation equipment, DOS system, electromechanical equipment and other places. 5. Small size, light weight, easy to carry, sturdy and durable, stable performance, convenient and practical. Specification: Item Type: Watt‑Hour Meter Model: D52-2066 Material: ABS Uses: used in chemical industry, power plants, automation equipment, DOS systems, electromechanical equipment and other places Measurement Accuracy: 1%±2 Words Measuring Range: AC Voltage: AC40.0-300.0V, AC Current: AC0-100.0A Current Display Resolution: 0.01A Power Frequency: 45.0Hz-65.0Hz Power Factor: 0.00-1.00PF Active Power: the measurement range is 0-30000W, the display resolution between 0-9999.9W is 0.1W, and the rest is 1W Electricity: 0-9999kwh, 0-999.99kwh, the minimum display resolution is 0.01kwh 1000.0-9999.9kwh, the minimum display resolution is 0.1kwh 10000-9999kwh, the minimum resolution is 1kwh Measurement Speed: about 2 times per second Installation Method: Rail Type How to Use: 1. Connect the measured voltage to the 1 and 2 terminals on the bottom left of the meter. 2. The built‑in transformer is wired according to the wiring diagram in Figure 1, and the wire of the measurement loop is passed through the hole under the meter. The penetration direction of the wire is arbitrarily selected by the user according to the situation of use. Or penetrate from the circular hole on the top of the meter and come out from the bottom. The different penetration directions will not affect the measurement results. 3. Connect the external transformer according to the wiring diagram in Figure 2, connect the 2 wires of the secondary end of the accurate current transformer with the meter to the 3 and 4 terminals on the upper left of the meter, and pass the wires of the measurement circuit through the mutual inductance. The round hole of the device. 4. The meter displays the measurement parameters after the power is turned on. 5. When it is necessary to reset the energy measurement (when measuring from zero), press and hold the button (RESET) on the right side of the instrument panel for 5 seconds (press and hold for 5 seconds) until the energy display is 0, release the button, At this time, the electrical energy is measured from zero. Electric energy has the function of automatically saving data when the power is cut, that is, when the measured voltage is disconnected or the power is cut off The meter will automatically save the current test data, and when the measurement power supply is reconnected, the meter will continue to accumulate on the previously saved data. The built‑in transformer (CT) hole diameter 11mm can pass through the national standard 12 square (mm) standard copper wire / can meet the load current 100A through, and the external transformer (CT) hole diameter 15mm can meet the national standard 21‑25 square (m) Standard copper wire passes through.. Package List: 1 x Smart Watt-Hour Meter1 x Manual Note: The measuring voltage range of this instrument is 250‑450V and only suitable for pure AC 45‑65Hz mains power, and the measuring range is 40‑300V without limitation.