My dad was a machinist so he always had calipers. I never thought I needed a set until I bought a cheap pair for under $10. I use it all the time.

The only problem? I'm left handed so I either end up using it upside down or trying it with my left hand and then switching to my right. They make left handed calipers but the cheapest I've found are over $40.

I think I'll keep fumbling with the cheap ones.