By Calculated Industries. The new Construction Master Pro Desktop. It works in any format. Find lengths for common rafters, regular & irregular; stores pitch in inches, degrees, & percentage. Also new expanded jack rafter functions. Board feet lumber estimating helps with material amounts. There are expanded circular solutions, full trigonometric functions, weight-per-volume functions and a user-set preference feature. It has three built-in memories and exponential notation function. Custom set standard building fractions, improved rake-wall key and "paperless tape are included.