True Angle 360° Adjustable Protractor 18" - True Angle is changing the way the world measures. No More Guessing – define, measure, and make any angle. With the True Angle Adjustable Protractor simply rotate the blades and read the dial. The hairline indicates the exact angle within a tolerance of 5/1,000’s. This 360° adjustable protractor makes it just as easy to make a 37 1/2° angle as a 45°. Make any angle within 30 seconds without using any math. True Angle Adjustable Protractor - A precision tool that increases accuracy, Has superior strength that won’t break or crack , Made of durable plastic with lifetime warranty, Produce angles more quickly and reduce related labor by as much as 75%, Available in 6”, 12”, 18”, 24” models depending on application. There is also a 4” diameter attachable dial available with large, easy to read graduations that fits all models.