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Walmart [walmart.com] has Tacklife Miter Saw Protractor Angle Finder (0-7"/Millimeter) for $ . Shipping is free w/ Walmart+ (free trial available [walmart.com]) or on orders $ 35+.

Product Description from Walmart
Very suitable for carpenters, plumbers and all construction industries, and also suitable for home use and DIY The 0° – 360° of any angle measurement is very practical Instead of the traditional miter saw protractor, saw protractor equipped with dual measuring modes Inch/mm. and Horizontal level