The Derwent Scale Divider is an ingenious drawing tool invaluable to artists. It makes it easy to transfer measurements from life, photographs and sketches ensuring you achieve accurate proportions every time. Scaler for transferring measurements into your artwork. Perfect for professional and amateur artists of all ages as well as student. Ultimate precision in a drawing tool: allows you to scale your pictures in ratios from 4:1 to 1:4 thanks to the 11 graduation holes.  Space-saving: Portable and folds neatly away.