Pro Art Triangle 8" Adjustable With Magnifier has 0.125" thick clear acrylic with white protractor arc and built-in magnifier that allows for precise settings. Thumbscrew knob locks angle in place. Combines functions of a triangle and protractor. Has three sets of graduations: degree, slope, and rise. Use as a drafting square when opened up to 90 degrees. Easily find trigonometric functions using included instructions.Details:Clear6.25" x 8" x 9.25"Combines functions of a triangle and protractorHas three sets of graduationsAcrylic