Starrett C359DZ Precision Universal Bevel Vernier Protractor, Through 360 Degree Graduations, 12" Blade SizeSatin chrome finish on all reading surfaces Sharp, machine divided scale to read 5 minutes (1 12 of one degree) Blades can be rotated and length adjusted as necessary; flush surfaces on the bottom allows use on height gauge Dial and blades can be locked independently Machine divided scale to read 5 minutes (1 12 of one degree) and accuracy is finer than can be read; the most comfortable and ultra sensitive fine adjustment for precision frame