Klein Tools ET250 is a solid-state, digital voltage and continuity tester. It measures AC/DC voltages up to 600V and tests for continuity. Additionally, the ET250 tests GFCI protected circuits to verify that the GFCI device is functioning appropriately. The tester includes a backlight and integrated flashlight for working in reduced ambient lighting conditions. Automatically selects voltage or continuity; automatically powers on when any measurement is attempted. Backlit LCD display. CAT IV 600V modern solid-state design for safety. Tests GFCI protected circuits. Uses standard replaceable multimeter test leads. Features built-in test lead holders on back of meter. Integrated flashlight. 9.8 ft. (3 m) drop protection. IP53 dust and water resistant.