The DeWalt DW073KD Heavy-Duty 18V Cordless Rotary Laser - Combo Kit provides accuracy, durability, versatility and visibility. It is designed for interior and exterior applications on both residential and commercial sites. For professionals, it is ideal for ceiling and wall installers, concrete workers, masons, remodelers and deck builders. The DW073KD is a manually leveled rotary laser that has dual side-by-side laser diodes for an extremely bright beam and is accurate to ± 1/4 at a radius of 100 (±1/8 inch at 50) with a visible diameter of 200. Long-range leveling to 600 is possible with the digital laser detector. Laser setup is quick and easy with the tools built-in three-in-one floor mount, adjustable rack-and-pinion wall mount and 5/8-11 inch threaded tripod insert.