The Calculated Industries Construction Master 5 (Model 4050) is a professional-grade construction math calculator designed for contractors, builders, and designers. It features built-in solutions for right-angle layouts, including rafters, framing, and stairs, and facilitates easy conversions between feet-inch-fractions, decimals, and metric units. The device includes a large 11-digit LCD display (7 normal, 4 fractions) and comes with a hard protective slide cover and a pocket reference guide

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