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I think in terms of metric for small detailed stuff- millimeters. etc.
but think in feet/miles for big stuff.
I can visualize 3mm.
I can Visualize 100miles.
I have no idea how to visualize 100 km (other that converting to miles and thinking in miles).
I know if I can't find A 1/2 inch wrench- I can usually try a 13mm instead.
3/4= roughly 19mm, etc. (in the world of HF tools- it's close enough-edit- if it's a bolt on something that's not a porsche or critical- IE- A bolt on my old tractor or something)
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