Great Bundle savings - Calculated Industries 4065 Construction Master Pro Advanced Construction Math Calculator and 44080 Construction Master Pro Construction Calculator Package Construction math calculator designed for construction professionals, performs common building formulas; area and volume calculations; works in various units, English/metric Plastic back, aluminium 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 Work in and convert between any building-math dimension; Built-in Right-Angle function, complete trigonometric function & D:M:S conversions Roof, Rafter and Framing Solutions; Complete Stair Layouts, calculates Weight per Volume, Footing Volume, Blocks, Roof Area Circular Calculations: Circumference, Arcs, Segments and More