Large keys and a jumbo LCD display with tilt head make the Desktop Model perfect for office use.  Includes all the features in the hand held model, plus full Trigonometric function.
 
Work in and convert between building dimensions
Quickly calculate area and volume
Built-in right-angle solutions for stairs, roof, rafters and framing
Circular calculations: arcs, circumference, segments
Find number of sheets: drywall, siding, panels - for an area