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Reviews around arm (5.00 of 5)
Helix 180° Shatter Resistant Swing Arm Protractor 6" / 15cm
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Mechanically, this is a pretty nice swing-arm protractor, but the colors do cause issues.
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The arm is easy to use and very accurate.
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Get the old-school plain clear ones with no fancy arm, the ones we all grew up using - sometimes innovation for its own sake does NOT make a product better.
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