Calculated Industries 4065-AB1 Construction Master Pro Advanced Construction Math Calculator 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 5.6 by 3 by 1/2 inches; display dimensions 0.86 by 2-1/2 inches; 3.2 ounces; 1-year warranty