Features: The rated test voltage is 500V, with a measurement range of up to 1000M and has the ability to measure AC voltage. Wide measurement range, with locking button, easy for you to choose and use. Can measure AC voltage below 500V (full scale linear indication). Low resistance value buzzer alarm, reminding you to pay attention and observe. The battery voltage status indicator light (BATT CHECK light on) also serves as a high voltage indicator for the operation of the megohmmeter. Additional external DC power supply (charging) socket for your convenience. Widened dial design, wider indication range, and more accurate fault diagnosis. The dial illumination function is convenient for you to use in dim environments and accurately read measured values. Automatic discharge function: After the measurement is completed, it automatically enters the discharge state to avoid electric shock caused by residual charges in the circuit. Strong output load capacity, with a maximum output short-circuit current of 0.55mA. Add a transistor withstand voltage measurement scale to directly read the withstand voltage value (load voltage) of the tested material. Fully functional, higher accuracy, convenient and reliable operation, it is an excellent electrician testing instrument. Comes with a pair of test leads and alligator clips, good quality zipper bag for carrying and storage. It is used to measure the insulation resistance of various electrical equipment and insulation materials such as transformers, motors, cables, switches, and electrical appliances, and to maintain, test, and verify famous electrical equipment. Specifications: Material: ABS Rated Test Voltage: 500V Output Voltage: 90~120% of the test rated voltage Output Short Circuit Current: Max. 0.55mA Measurement Range: 0-1000M Transistor Withstand Voltage Measurement: 500V (0.5mA) Discharge Resistance: 10M Automatic Alarm: 50M Operating Temperature/Humidity: 0~40,