My digital caliper is a cheap piece of junk, but it still does the job well enough. People who have never worked in precision manufacturing have no idea how much work there is, or how easily it can go wrong. My drafting instructor had a large aluminium block that had 95% of the original material milled away for a fancy housing, and it had to be scrapped because just one fastener hole was outside the specified tolerances. Now it's a paperweight and classroom demo about the importance of tolerances. Loose parts, though? That's scary stuff!
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That must be so nerve-racking when you are working on a more complex bigger piece, metals are so expensive these days. Luckily I don’t have that kind of pressure, but of course one has to be careful all the time because these machines are complex and expensive.
Don’t worry, nothing actually got loose on me.