Feature: 1. 3 in 1 Display: The multifunctional meter prominently features voltage, current, and frequency on an LED screen, providing clear and easy to read measurements for enhanced user convenience. 2. Wide Measurement Range: This device covers AC voltage from AC50-500V, current up to 120A, and 10.0-99.9HZ frequency range, offering 1% accuracy and a fast measurement rate of twice per second. 3. No External Power Required: Simply connect two wires to the measured voltage to obtain voltage and frequency readings, eliminating the need for an additional power source for efficient measurement. 4. Compact and Versatile Design: Measuring just 72x72mm with a 68x68mm mounting hole, this voltage frequency meter can be flexibly installed anywhere, adapting to diverse environments and spaces. 5. High Efficiency and Speed: This multimeter ensures high operational efficiency, allowing quick and stable data acquisition for technical and engineering applications. Specification: Item Type: Digital Multimeter Material: ABS Measurement Accuracy: 1% (2 words) Installation Hole Size: Approx. 68 x 68mm / 2.68 x 2.68in (Embedded installation) Digital Color: Red Measurement Range: AC50-500V 0-120A 10.0-99.9Hz Display Mode: LED LED Font Size: 0.56 inches Panel Size: Approx. 72 x 72mm / 2.83 x 2.83in . Package List: 1 x Multifunctional Multimeter 2 x Installation Accessories 1 x Sensor Note: This AC current meter is only suitable for pure AC 50-60HZ power supply, it cannot be used for square waving, inverter output, and modified sine waving sine waving circuit measurement, otherwise the meter head will be damaged.