This Construction Master Pro calculator is a must-have for builders, contractors, draftspersons, engineers, framers, and carpenters. It helps you calculate areas and volumes, roof, rafters, and framing solutions, complete stair layouts, and circular calculations like arcs and circumferences. Built-in right-angle functions make your work easier and more accurate. Designed to work on and convert between building dimensions. Open box with package Model 4065
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