Calculated Industries 4065-SRL Construction Master Pro Advanced Construction Math Calculator with Swanson Torpedo Level,Calculated Industries,4065-SRL" /> Financial calculator designed for construction professionals Performs common building formulas; area and volume calculations; works in various units, English/metric Plastic back, aluminum front, soft rubbed buttons Includes 2 3-volt lithium batteries, user guide, quick reference guide, protective slide cover Includes Bonus Swanson Torpedo level