What is Cosine Error?

What is cosine error? Let's put a dial test indicator on the plunger of a dial indicator to SHOW why the angle of measure affects in the measurement!
Test Indicator:amzn.to/2mFQzsF
Dial Indicator: amzn.to/2njXmVV
Noga Mag Base: amzn.to/2mAcwFZ
Interested in Metrology? Be sure to check out:
Tom Lipton: bit.ly/2mko04F
Robin Renzetti: bit.ly/2lV91Ns
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Music copyrighted by John Saunders 5 Reasons to Use a Fixture Plate on Your CNC Machine: bit.ly/3sNA4uH