Digital megohmmeter has three test voltages-250, 500, and 1,000V-for measuring insulation resistance to 2,000 megohms, and also measures low-resistance to 2,000 ohms | Measures AC voltage to 600V, lighting a warning indicator when a live circuit is detected | Residual voltage is automatically discharged from the circuit under test when the test button is released | Overload protection helps prevent damage to the meter | Meets IEC safety standard 1010-1 and is rated for CAT III installations to 600V