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 use. Measures AC voltage up to 500V with full scale linear indication. Low resistance buzzer alarm alerts users for increased attention. Battery voltage status indicator light (BATT CHECK) also functions as a high voltage indicator during operation. Includes external DC power supply (charging) socket for added convenience. Widened dial design provides broader indication range and improved fault diagnosis accuracy. Dial illumination feature allows for clear readings in low-light environments. Automatic discharge function activates after measurement to prevent electric shock from residual charges. Strong output load capacity with maximum output short-circuit current of 0.55mA. Equipped with transistor withstand voltage measurement scale for direct reading of tested material's withstand voltage. Fully functional with high accuracy, offering convenient and reliable operation—ideal for professional electrical testing. Includes a pair of test leads, alligator clips, and a quality zipper storage bag. Designed to measure insulation resistance of various electrical equipment and materials such as transformers, motors, cables, switches, and appliances; suitable for maintenance, testing, and verification of electrical systems. 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