CONSTRUCTION MASTER PRO Specifications: Includes: (1) 5022-4 Rugged Shock Dust and Moisture-Resistant Armadillo Gear Protective Case (1) Pocket Reference Guides in English and Spanish and (2) LR44 Long-Life Batteries The Construction Master Pro is an award-winning advanced feet-inch-fraction construction-math calculator with powerful built-in solutions ideal for completing layouts plans bids and estimates. Calculate circles roofs stairs and more. Works in and converts between feet-inches-fractions and decimals including metric. Use it in the field or office to save time reduce costs prevent re-work and maximize profits.