Pacific Arc 6" 360° Protractor

Professional Protractors Made from pure clear acrylic to ensure long life and value. Graduations are etched onto the surface to prevent wearing off.
A protractor is a measuring instrument for measuring angles. Most protractors measure angles in degrees (°). Most protractors are divided into 180 equal parts. 
They are used for a variety of mechanical and engineering-related applications, but perhaps the most common use is in geometry lessons in schools.