EAI Education Slide N' Measure Compass: Clear - Set of 10 Combines a ruler, drawing compass, and protractor in one handy tool Precision design lets produce exact drawings of shapes, circles, triangles, and straight lines Radius slider adjusts with the push of a finger for precise measurements Calibrated in inches (5" long) and centimeters (12cm long) with a 180 protractor Recommended Grade(s): 3-12