Feature:1. This instrument applies automatic voltage release function, with high stability and reliability, with maximum 1999 counts, 0.1M-2000M insulation resistance measuring.2. It is suitable for measuring the insulation resistance of various electrical equipments and insulating materials such as transformers, motors, cables, switches, electrical appliances, etc. It is suitable for maintenance, repair, test and etc..3. Rated output voltage is variable, easy to switch between 100V/ 250V/ 500V/ 1000V through the rotary knob. And it can measure AC voltage with the range of 1-750V.4. High voltage indication to remind you of safe operation; low battery indication to remind you of replacing batteries in time.5. The instrument has fashionable appearance and stable performance. With large digital LCD backlit display, easy to read.6. Battery powered or external DC 12V power adapter powered, satisfying different needs. Automatic shutdown after about 22min idle time to save power.7. Drop resistant silicone protective sleeve for protecting the tester from damage. Comes with a zipper storage bag for easy storage and portability.Specification: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.Specifications:Color: BlueMaterial: ABS + SiliconeScreen: LCD Backlit ScreenOutput Voltage: 100V/ 250V/ 500V/ 1000VInsulation Resistance Measurement: 0.1M-2000MTest Current: 1mA (250V/ 500V/ 1000V)Short-circuit Current: 1.8mAAC Voltage Measurement: 1~750VAC Voltage Frequency: 40-70HzJack Position: L, EPower Supply: 6 * 1.5V AA Battery (Not included) or External DC 12VAuto Shutdown: about 22minMaximum Display: 1999Item Size: 170 * 129.1 * 63.4mm / 6.69 * 5.08 * 2.49inItem Weight (without battery): 543g / 1.20lbsPackage Size: 21 * 17.8 * 7.8cm / 8.27 * 7.01 * 3.07inPackage Weight: 860g / 1.90lbs.Package List:1 * Insulation Resistance Tester2 * Test Pen2 * Alligator Clip1 * Storage Bag1 * User Manual (English)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.