How did we invent measuring precise tool.

[Bob Korves]

I have a cheap Harbor Freight electronic caliper that is only used for rough work. It is quite useful in that way, and I doubt most people could tell any difference between the one I have used for rough work over a couple decades and the one only used for nicer work. I also have much nicer calipers and other metrology tools, and I try to use them all carefully and keep them clean and properly put away after use. I consider a caliper that I paid less than $10 for can be considered expendable over the long run...

 

[Dabbler]

I guess that my view is very simple: Do what you do. Don't tell me what to do. I won't tell you what to do or judge you. I'll learn whatever I can from you (both positive and negative) and apply it as best as I can. But I might kick you out of my shop for judging me

 

[Koi]

I thought this was an interesting video on the subject.

I've seen it but it didn't expalain anything about how we got to measure with such high decimal like 0.001mm for example.