M-D Building Products 92092 SmartTool and American Level Combo Pack,M-D Building Products,92092" /> Measures levels in all 360-Degree with audible beep at level and plumb for times you can't see the display Shows angles in degrees, Percent slope, and inches per foot rise over run at up to 0.1-Degree accuracy Over 2 million sold to professionals and home owners alike around the world with many still in use after over 10 years for proven, unmatched quality, reliability, and durability Used by construction professionals, inspectors, and consultants to assure ramps and floors meet American Disability Act stringent specifications Over 500 hour battery life is many times longer than knock-off products so you don't have to stop in the middle of a critical job