Features: 1. Connect the wire according to the wiring diagrams in the attached figure, connect the secondary end (green-lead) of the current-transformer with the instrument to the blue terminals of the instrument. 2. Pass the lead of the measuring circuit through the middle round hole of the current-transformer once. 3. Connect the lead of voltage measurement to the green-terminals of the instrument. 4. Then connect the measurement voltage. Start reading the measurement results. 5. The electric energy (kilowatt-hour) display will automatically save data for you in-case-of power failure, when measuring when the voltage disconnected or power cut-off, the instrument will automatically save the current electric energy. Specifications: Material: Plastics Measuring Range: AC80-300V / AC200-450V, Active Power: (measuring voltage AC80.0-30.0V) 0.0-30000W AC200.0-450.0V: 45000W Electric Energy: 0.000-99999Kwh, decimal-point automatic conversion Power Factor: 1.000-0.000 Measuring Speed: About Once Every 2 Seconds Size: Approx. 7.8x4.4x4.7cm/3.07x1.73x1.85in Type: 80V/200V Note: If 200-450V machine used for testing voltage lower than 200V, the instrument will not work. Please note that! The wiring of voltage input (green) terminals and current-transformer secondary input terminals (blue) terminals cannot connect incorrectly, or the instrument will be damaged!!! This instrument only applicable to pure-AC 50-60HZ mains power-supply, and cannot be used for measurement on square wave-inverter output and modified sine wave-circuit, otherwise the instrument will be damaged. Package includes: 1x Multimeter