7 in 1 Slide Caliper

This slide caliper was designed to be used in a Junior High School Engineering program called Project Lead The Way. It has seven uses...Slide Caliper, Ruler, Score, Fold, Cut, Compass, Protractor. Download your choice of rule (Imperial, Metric...) I used http://www.vendian.org/mncharity/dir3/paper_rulers/. Or even make up your own measurement system. The groove on the back serves as a score line for scoring paper and card stock and a guide for students to use to cut paper with an x-acto knife (instead of cutting into their desks!) By taking off the slide and reversing it (see picture) tool can be used to draw circles. By using the corner of the tool, each small circle you see is a radial from that corner at 5 degree increments. (see picture)