Product Features Measure insulation resistance, AC voltage, DC voltage, and more. Large 2.7" (65mm x 25mm) LCD screen with digital readout and backlight for enhanced visibility. Overload indication to ensure safe operations. Automatic measurement and voltage discharge. Red alarm light activates during high voltage output for added safety. Low battery indicator to maintain measurement accuracy. 10MΩ internal resistance testing capability. High accuracy, stable performance, easy to operate, and reliable. Ideal for professional electric equipment maintenance, testing, and inspection. Protective red lid for button and screen safeguarding. Comes with a convenient storage pouch with a smooth zipper closure. Specifications Material: PP Maximum Display: 1999 Insulation Resistance (Ω): Test Voltages: 100V, 250V, 500V, 1000V (0% ~ 10%) 100V: 0.00MΩ ~ 100MΩ ±(3%+5) 250V: 0.00MΩ ~ 99.9MΩ ±(3%+5); 100MΩ ~ 5.5GΩ ±(5%+5) 500V: 0.00MΩ ~ 99.9MΩ ±(3%+5); 100MΩ ~ 5.5GΩ ±(5%+5) 1000V: 0.00MΩ ~ 99.9MΩ ±(3%+5); 100MΩ ~ 5.5GΩ ±(5%+5) Load Current: 50V (R=50KΩ) 1mA 0% ~ 10% 100V (R=100KΩ) 1mA 0% ~ 10% 250V (R=250KΩ) 1mA 0% ~ 10% 500V (R=500KΩ) 1mA 0% ~ 10% 1000V (R=1MΩ) 1mA 0% ~ 10% Short Circuit Current: