Calculated Industries 4065-AG Construction Master Pro Calculator with free Armadillo Gear Case. The powerful built-in solutions of the Construction Master Pro are perfect for completing layouts, plans, bids and estimates Work in and convert between all building dimensional units, including feet, feet-inch-fraction, inch fraction, yards and meters, square and cubic formats Right angle solutions include roof, rafters, hip/valley, jacks, cutting angles and stair layouts Advanced circle solutions, D:M:S to decimal degree conversions Includes a rugged shock, dust and moisture resistant Armadillo Gear protective case