HEAT INSULATION Features: 4 measurement/ test functions 5 insulation resistance test ranges at 50V, 125V 250V, 500V and 1000V Insulation resistance scale upto 4000MΩ AC/DC voltage range of 0V...750V High speed Comparator Function of 0.3 seconds Bar Graph display Live Circuit Indicator  Drop Proof The Hioki IR4057-20 Digital Multimeter and Insulation Resistance Tester offers an insulation resistance test at 50V, 125V, 250V, 500V and 1000V DC with an insulation resistance scale of 0...4000MΩ. This meter also includes Voltage measurements with a 0V...750V range and a resistance measurement range of 0Ω...1000Ω. This meter also come with a high speed comparator function that alerts the user to failed tests with a buzzer and red LED. Includes: Test Lead L9787 Neck Strap Instruction manual LR6(AA) alkaline batteries