The Calculated Industries Construction Master Pro Desktop 44080 Scientific Calculator incorporates all the amazing features of the Construction Master IV and also has some new Pro functions which make it even better. This scientific calculator is an essential tool for builders, architects and engineers and is very easy to use. With easy labels and bigger keys, users can get their calculations right at the first attempt itself; infact, the Master Pro Desktop calculator is so simple to use, even amateurs will not have a problem using it.