Extra-large display and tilt head for office use. 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 CD-ROM with English and Spanish how-to CD and user guides long-life battery and full one-year limited warranty.