Multipurpose DIY at its finest! This compact, foldable ruler measures from 15cm to 30cm at its longest, and includes a protractor to measure angles as well. Not just for math homework, this item is handy when ordering a product online, for instance, to easily check and compare how large that product is. Also works fantastically while drawing or designing, keeping lines straight and neat. Keep it at home or take it on the go in your pencil case or backpack!