Calculated Industries Construction Master Pro Project Calculator is an essential tool designed for serious building professionals, contractors, and architects. This advanced calculator performs calculations directly in feet, inches, fractions, yards, meters, centimeters, and millimeters, including square and cubic formats for each measurement type. It instantly converts between any dimensional formats, making complex measurements simple and accurate. The calculator features custom rafter keys for common rafters, regular and irregular hips, valleys, and jacks, as well as an enhanced stair key that calculates the number of risers and treads, riser height and tread width, stringer length, and incline angle. New professional features include block and footing keys, rafter cutting angles, roof area calculations, column and cone solutions, a backspace key, and conversions between degrees, minutes, seconds (D.M.S.), and decimal degrees. Additional functionalities include board feet estimating, weight-per-volume conversions, three memory slots, and a paperless tape that remembers the last 20 entries. The calculator is compact and portable, measuring 5.6 inches in length, 3.0 inches in breadth, and 0.6 inches in thickness. It comes boxed and includes two LR44 batteries for immediate use. Model Number: 4065