Features: 100V/250V/500V/1000V rated test voltage, with a measurement range of up to 2000MΩ and capable of measuring AC voltage. Wide measurement range with locking button for easy selection and operation. Measures AC voltage up to 500V with full-scale linear indication. Low resistance buzzer alarm alerts the user for improved safety and monitoring. Battery voltage status indicator light (BATT CHECK) also functions as a high voltage indicator during megohmmeter operation. Equipped with an external DC power supply socket for added convenience. Widened dial design provides a broader indication range for more accurate fault diagnosis. Dial illumination function allows for clear readings in low-light environments. Automatic discharge function activates after measurement to prevent electric shock from residual charges. High output load capacity with a maximum output short-circuit current of 0.55mA. Includes transistor withstand voltage measurement scale for direct reading of material withstand voltage (load voltage). Fully functional, high accuracy, reliable and convenient to operate, making it an excellent electrical testing instrument. Includes a pair of test leads, alligator clips, and a durable zipper storage bag. Designed to measure insulation resistance of various electrical equipment and materials such as transformers, motors, cables, switches, and appliances; ideal for maintenance, testing, and verification. Specifications: Material: ABS Rated Test Voltage: 100V/250V/500V/1000V Output Voltage: 90–120% of rated test voltage Output Short Circuit Current: Max 0.55mA Measurement Range: 0–2000MΩ Transistor Withstand Voltage Measurement: 100–1000V (0.5mA) Discharge Resistance: 500kΩ–5MΩ Automatic Alarm Threshold: 50MΩ Operating Temperature/Humidity: 0–40°C, ≤80% RH