Reliable preowned Construction Master IV by Calculated Industries. Includes blue Armadillo Gear case with reference guide inside. Fully tested and working. Ideal for contractors, builders, and architects needing accurate dimensional calculations. Minor cosmetic wear from prior use. ? Calculates: ? Feet-Inch-Fractions ? Area, Volume, Angles ? Stairs, Rafters, Arcs More Thanks so much for visiting my store! I happily accept offers on most items?just click ?Make Offer!? Please note: I do not ship on weekends or holidays. Have any questions? I?m happy to help! Be sure to check out my other listings for more unique finds!