... 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 Plumbing, HVAC, Plumbing, Pipe ... Easily Lay Out Right Angles; Establish Diagonals and Footings for Decks, Porches, and Patios; Grade Determination; Dry Wall Installation. ...