CTU7648 AngleViewer™ allows everyone to see and measure angles more easily with color! This revolutionary tool enables students to measure acute, obtuse, and reflex angles easily and visually. Angles are now accessible to students of all learning styles and levels. With this durable and easy-to-use tool, you will never use a protractor again!WARNING CHOKING HAZARD: Small Parts. Not for Children Under 3 yrs.