This is a really nice video if you are interested in measurement precision for manufacturing:

Machine Thinking: Origins of Precision and first project introduction https://youtu.be/gNRnrn5DE58

The first is an AvE video, the one that introduced me to Wringing.

There's also a Cody's Lab video where he sees if they will wring in a vacuum: https://www.youtube.com/watch?v=jNEvS_bjKIo (using AvE's blocks)

While a lot of analog measurement tools have been replaced by digital ones, Gauge Blocks are still often used as the de facto reference(Though CMM machines[1] are becoming more and more common).

You have a 'Master Set' of expensive Gauge Blocks that you use as a definite reference. Stacks of which can be combined with various tools for various purposes. https://i.ytimg.com/vi/2d-hGd_kYLc/maxresdefault.jpg https://images-na.ssl-images-amazon.com/images/I/61RhwssKaBL... https://i.ytimg.com/vi/n572qMo3g0A/maxresdefault.jpg

The 1 Inch block always seems to go missing.

[1] https://en.wikipedia.org/wiki/Coordinate-measuring_machine

Fun video from Sixty Symbols explaining the underlying forces at work - https://www.youtube.com/watch?v=mgL_qH70KAU

I knew AvE's video would show up :D

I love this guy's units. 1/4 of a bee's dick is my favorite.