Koala Tools Ring Ruler, Standard

This Ring Ruler™ is the first size-adjustable, circular ruler. It has been designed to make the drawing and measuring of circles and arcs a much simpler, more efficient experience by eliminating the cumbersome pivot-point system. Not only is the natural feel of expanding and contracting a circular ruler more ergonomic than using a needle compass, it is also quicker, safer and provides the more useful circular metrics of diameter and circumference (arc length). Rule is 19" long; maximum diameter is 6". One of the best features of the Ring Ruler™ is its simplicity. This makes it a great learning tool for children – especially ones too young to handle a circle compass.

Size-adjustable, circular ruler Makes a great learning tool for children Designed to make the drawing and measuring of circles and arcs a much simpler, more efficient experience by eliminating the cumbersome pivot-point system Rule is 19" long; maximum diameter is 6"