This clear ruler includes an E scale, picas, points, printer rules, and a leading gauge. Calibrated in 16ths to the inch, this helpful tool features sharply delineated markings and a transparent body that work together to make taking measurements easy. 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 us an unparalleled reputation.