Calculated Industries 7200 AccuMASTER Digital Waterproof IP67 Torpedo Level and Protractor, Magnetic, 9-inch Waterproof IP67 protection and wide -4F to 140F degrees operating temperature range for harshest working environments Large, bright green LED display with .375" digit height for day or night visibility; smart display automatically inverts when level is upside down Dual functionality as a true (absolute) digital level and electronic inclinometer / protractor lets you set or check relative angles between surfaces Accuracy to +/- 0.05 degrees and displays angle and bevel readings in degrees, pitch IN/FT, mm/M, and percent slope Magnets sealed inside v-groove base stay cleaner and firmly attach to ferrous metal surfaces like conduit, pipe, steel construction framing and more