Heavy duty, foldable steel protractor rule with metric and imperial markings. Integrated angle finder for angle measurements. Knurled tightening screw. Rotates 360° with +/- 1° accuracy tolerance. Measures angles and length. Heavy duty, foldable steel protractor rule with metric and imperial markings. Integrated angle finder for angle measurements. Knurled tightening screw. Rotates 360° with +/- 1° accuracy tolerance. Measures angles and length.