Advanced Feet-Inch-Fraction Construction-Math Calculator with Full Trigonometric Functions The Construction Master Pro Trig Feet-Inch-Fraction calculator provides the building professional complete trigonometric function. This powerful and advanced construction-math calculator features new built-in solutions and expanded preference selection. It allows you to easily determine precise angle measurements and solve the most complex design and construction-math problems. Perfect for estimating materials and costs. In the field or office it helps assure accuracy, save time and money. This is a brand new item, we are an authorized Calculated Industries dealer.