Westcott Proportional Scale is perfect for quick plotting and estimating number of acres. The lightweight and laminated material makes this measuring tool durable and reliable for artists, designers, architects, engineers, and students. It's transparent making allows viewing through to the page while you work. Westcott brand focuses on creating innovative designs that provide style and quality to an assortment of school, craft, and office products. Westcott Drafting and 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.