This is a multifunction instrument that can measure insulation resistance and AC voltage. It has fashionable appearance and stable performance, can be used for measuring electrical machinery, cable, electromechanical equipment, telecom equipment, electric power facilities and other insulation resistance. Note: 1. Please read the user manual carefully before use. 2. Size and color may be slightly different due to manual measurement and different light conditions. Thanks for understanding. Specifications: Color: Orange/ Blue (Optional) Material: ABS 43; Silicone Screen: LCD Backlit Screen Output Voltage: 100V/ 250V/ 500V/ 1000V Insulation Resistance Measurement: 0.1M-2000M Test Current: 1mA (250V/ 500V/ 1000V) Short-circuit Current: xff1c;1.8mA AC Voltage Measurement: 1~750V AC Voltage Frequency: 40-70Hz Jack Position: L, E Power Supply: 6 * 1.5V AA Battery (Not included) or External DC 12V Auto Shutdown: about 22min Maximum Display: 1999 Item Size: 170 * 129.1 * 63.4mm / 6.69 * 5.08 * 2.49in Item Weight (without battery): 543g / 1.20lbs Package Size: 21 * 17.8 * 7.8cm / 8.27 * 7.01 * 3.07in Package Weight: 860g / 1.90lbs Package List: 1 * Insulation Resistance Tester 2 * Test Pen 2 * Alligator Clip 1 * Storage Bag 1 * User Manual (English)