Repeat Reading Gauge
and Checking Surface
Plate Calibration.
John Saunders: DIY Rahn Repeat-O-Meter Part 1: CAD Design:
https://youtu.be/ra727zZCMzk
Tom Lipton: Repeat O Meter:
https://youtu.be/ZkCIVsP7-KY
Robin Renzeti: DYI Surface Plate Calibration:
https://youtu.be/6nY7uW1uG9s
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