Project perfectly straight lines with laser levels from Grainger. Straight line levels let you project a straight line of light across a wall, floor or ceiling. Shop here for cross line, alignment dot, plumb beam laser levels and more. A rotary laser level gives you the advantage of a 360° projection arc, letting you project level references on all interior surfaces at once, horizontally, vertically or at any preset angle. Shop Grainger today for high quality laser levels.