A Mathey Dearman Protractor is the perfect tool to determine/set bevels, transfer angles, and measure the squareness of one surface to another.
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The Large Protractor (DK100) is made of aluminum for easy handling. Protractor blades can be locked in place at specific angles and the heads have dual graduations from 0° to 180° in both directions. The Large Protractor will measure squareness of pipe ends up to 40" (1016 mm) diameter or can be used to check large pipe miter angles up to 180º.