1.Laser level 2. 1V1H 3. Red Line 4. Accuracy: +3/8"/100ft. 5. CE, GS, ROHS 1V1H Automatic Self-Leveling Rotary Laser Level Two highly focused self-leveling laser beams provide accuracy of 3/8"-in at 100 feet. Tough on the jobsite. Resists water, dirt and dust (IP54) Use to: Plumb and Align: Walls, Doors, Frames, Stud Beams, Windows and Skylights; Level Electrical Outlets; Stud and Curtain Wall ...