Features: Measures insulation resistance, AC voltage, and DC voltage. 2.7-inch (65x25mm) large LCD screen with digital readout and backlight for clear visibility. Includes overload indication for safe operation. Automatically performs measurement and discharges voltage. Red alarm light activates during high voltage output. Low battery indicator alerts when battery replacement is needed to maintain accuracy. 10MΩ internal resistance test capability. Offers high accuracy, stable performance, easy operation, and reliable results. Designed for professional use in electrical equipment maintenance, testing, and inspection. Protective red lid safeguards buttons and screen. Includes storage pouch with smooth zipper closure. Specifications: Material: PP Maximum Display: 1999 Insulation Resistance (Ω): - Test Voltages: 100V, 250V, 500V, 1000V - Measurement Ranges and Accuracy: - 100V: 0.00MΩ to 100MΩ ±(3%+5) - 250V: 0.00MΩ to 99.9MΩ ±(3%+5); 100MΩ to 5.5GΩ ±(5%+5) - 500V: 0.00MΩ to 99.9MΩ ±(3%+5); 100MΩ to 5.5GΩ ±(5%+5) - 1000V: 0.00MΩ to 99.9MΩ ±(3%+5); 100MΩ to 5.5GΩ ±(5%+5) Load Current: - 50V (R=50KΩ): 1mA ±10% - 100V (R=100KΩ): 1mA ±10% - 250V (R=250KΩ): 1mA ±10% - 500V (R=500KΩ): 1mA ±10% - 1000V (R=1MΩ): 1mA ±10% Short Circuit Current: Not specified