Construct incredible designs with utmost ease using the Construction Master Pro 4065 calculator. Use the rise, run and pitch keys of this Calculated Industries construction calculator to get accurate solutions for roof, stair and rafter layouts. The complete stair layout of this Calculated Industries calculator delivers accurate calculations with floor thickness and stairwell openings for risers, treads, stringers. Moreover, the circular calculation feature of this Calculated Industries construction calculator measures the circumference, arcs and area with efficiency. Furthermore, calculate the area and room volume using the length, width and height keys of this Calculated Industries calculator. The Construction Master Pro 4065 calculator with 15.88mm x 63.5mm LCD display ensure that you will not miss even the minutest details of the calculation.