Advantages of using a vernier bevel protractor
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U get acurate measurements
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The bevel protractor is used to establish and test angles to very close tolerances. It reads to 5 arcminutes (5′ or 112°) and can measure angles from 0° to 360°. The bevel protractor consists of a beam, a graduated dial and a blade which is connected to a swivel plate (with Vernier scale) by thumb nut and clamp.
From Wikipedia
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