Work smarter, build better, and improve your bottom line with this Calculated Industries Construction Master Pro Advanced Construction Math Calculator (4065). It has the best features of the original Construction Master IV with some useful new "Pro" functions, which made it even easier to use. An essential jobsite tool, it's the most complete Builder's Calculator on the market. It was designed specifically for builders, general contractors, construction foremen or superintendents, carpenters, framing contractors, concrete/foundation contractors, re-modelers and other construction pros.