Extra large display and tilt head for office use. Features: Works in and converts between all building dimensional formats. Solves right angles including rafters, rake-walls, slopes and squareups. Stair layout calculations. Complete circle solutions. Full trigonometric functions. DMS conversions. Areas and volumes. Calculates footing volume, blocks, roof area, board feet, material cost/estimation problems and more. Includes easy-to-follow User's guide, longlife battery and full one year warranty.