Accuracy: ?2″.
To inspect protractor, taper gage, index plate, index head and goniometer, can also be used to set angle.
Made of special alloy steel, hardness HRC64, high stability, wear resistance and easy combination.
Can be combined to any angle with interval 6 seconds after combination (6″, 12″, 18″, … , 360?).

3M 45033, High Intensity Prismatic Reflective Digital Sheeting 3930UDS, White, 24 in x 50 yd, 1 Roll/Case, 7100282394
3M 97983, Hi-Strength 94 ET Adhesive, Clear, 5 Gallon Drum (Pail), 7100022993
3M High Performance Flatback Tape 2519, Tan, 100 mm x 55 m, 8 Roll/Case, 7100243539 