Made from durable plastic, this protractor ruler features a clear scale that ensures long-lasting use, resisting breakage and deformation. The protractor leg can rotate around the scale, allowing the approximately 7-inch arm to extend to about 12 inches, enabling precise and efficient angle measurements—ideal for drawing and other tasks. These clear plastic goniometers are highly practical, making them essential tools for artists, construction workers, designers, carpenters, architects, teachers, engineers, students, and anyone with drawing needs, offering significant convenience in both work and daily life.