The Starrett 505P-7 Miter Saw Protractor is designed to take the guesswork out of cutting miters. It works like a bevel gauge, but instead of just capturing the angle, it has a dial at the hinge point that indicates the correct angle to set the saw to. The tool has two readings on it, one for miters and the other for butt joints, making it a single reference for all but the most complicated cuts. It's made of durable plastic and has laser-engraved markings. A similar model (505A-7) is available in aluminum.
¦ Price: $20. 978-249-3551. www.starrett.com.