Johnson 40-6517 Rotary Laser Self Leveling KitRated for outdoor and indoor use at up to 800'., the Johnson Self Leveling Rotary Laser Level Kit provides pinpoint accuracy within 1 4 in. at 100 ft. to aid electrical, plumbing, landscaping, grading, carpentry and installation tasks. The level works effectively over long distances and has visual and audible alarms when the laser goes beyond its intended range. Versatile and accurate, it has self leveling capability in the horizontal plane and manual