Digital Protractor
Photo: Mark Weiss
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Digital Protractor

Bosch's digital angle finder is arguably the most accurate tool we tested, and certainly the most idiotproof. Press each of its legs into a corner and get a digital readout to a tenth of a degree. The tool comes with two vials so you can be sure it's level on both sides of the corner as you take a reading. About $130, Bosch
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