... to:Plumb and Align: Walls, Doors, Frames, Stud Beams, Windows and Skylights; Level Electrical Outlets; Stud and Curtain Wall Plumbing, ... HVAC, Plumbing, Pipe Installation, etc.; Easily Lay Out Right Angles; Establish Diagonals and Footings ... for Decks, Porches, and Patios; Grade Determination; Dry Wall Installation ...