Derwent Artists SCALE DIVIDER enlarges & reduces proportion ruler
Scale divider set.
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. This practical drawing tool allows you to scale your pictures in ratios from 4:1 to 1:4. When not in use it folds neatly away and will slip easily into a backpack when you are out and about.