Level - Built-in vertical and horizontal spirit levels, accurate to 0 +/- 0.05° Versatile measuring tool, 4 tools in one - Anglefinder, Compound Cut Calculator, Protractor, Level Anglefinder - Determines the exact angles of jobsite or workpiece, eliminating guesswork Compound Cut Calculator - Automatically determines the exact miter and bevel setings necessary to make each crown molding cut fit precisely. Protractor - precisely positions the workpiece or intended cut line at the desired angle, Manufacturer: Bosch