Westcott 6” Proportional Measuring Scale calculates enlargements and reductions. It is easy to use as calibrations for fractions below an inch are printed in a second color! Perfect for all your drafting and drawing needs. Westcott Drafting & Drawing Tools are some of the finest products of their kind for students and professionals. Our commitment to meticulous quality and cutting edge innovation in measurement and art materials has earned an unparalleled reputation.