The Construction Master Pro from Calculated Industries is an advanced construction-math calculator. Suitable for woodworking contractors, estimators, architects, carpenters and other pros, the calculator comes with a range of built-in features and broad preference settings. Recent enhancements enable the calculator to handle calculations on drywall, stairs, studs on center, compound miter cuts, arched rake-walls and more. 800-854-8075, Calculated.com.