Features Split-type Design: Easy installation with separate transformer placement, enabling flexible positioning for accurate measurements. Two-wire System: Simplifies setup with no need for power supply connection, allowing simultaneous voltage measurement with no polarity splitting. Integrated High Precision Transformer: Eliminates the need for additional purchase, ensuring accurate current testing without extra expenses. Self-Calibration Capability: Features a fine-tuning potentiometer in the watch head to independently calibrate voltage and current errors. 100% Brand New and High-Quality: Assures reliability and durability for long-term performance. Specification: The range of voltage measurementNo direct exposure Package List: 1 * Current voltmeter head 1 * mutual inductance coil 1 * adapter Note: The wiring sequence of the instrument is: the circuit of the current loop is connected first, the 220V voltage is finally connected, after connecting the 220V power supply, it can not touch any parts and circuits behind the instrument to prevent the danger of electric shock. Split: Green terminal is connected to AC transformer CT, two yellow lines are connected to measure AC voltage, do not connect wrong, connect wrong will cause instrument damage, the responsibility is self-conceited. This meter is designed based on the principle of capacitance step-down, because the higher the frequency, the smaller the impedance of the capacitor, so it is not suitable to be used in high-frequency electronic speed regulation, non-city electric sine wave frequency, or other ocns where there are high-frequency components, otherwise it is easy to burn down! When selecting the range, the larger the range is, the greater the range is, the greater the error is. It is suggested that 1.5 times the actual test value be. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. Package List