This beautiful instrument measures angles from 0° to 360° with easily visible accuracy as precise as 5 minutes, or 1/12 of a degree. It comes with 11″ and 7″ adjustable blades, as well as a 3″ long 90° reference attachment (inset photo). Construction is all stainless steel. Blades can be locked anywhere along their length, and the bezel can be locked at any angle. For drafting, determining existing angles, or setting up machines and jigs, it’s the most versatile and most precise protractor we’ve ever offered.