Starrett CP505E-12 Electronic Protractor
I’ve picked this Starrett protractor as my number one pick because of their reputation for having provided machinists with high quality measurement equipment for years. This protractor provides the same level of quality and accuracy to both the contractor and woodworker.
The protractor works in a number of different modes, controlled by a simple three button control, a miter mode which reads out in actual saw readings, and a single cut mode for but joints. Bubbles for both vertical and horizontal directions allow you to measure an angle off of a vertical plane and the 360 degree swing allows you to measure any and all angles.