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Centimeters aren't metric. On a construction site if you use CM and not millimeters they use machinery to give you a wedgie.
I think you're confusing metric units with SI base units. Those are typcially the ones without any prefix (so a metre, not centimetre or milimetre). But all the prefixed versions are still metric.
Meanwhile second is the SI base unit of time, but it's not metric.
Those are typcially the ones without any prefix
With the notable exception of the kg...for some inexplicable reason.
Thanks for that tidbit, I just think there's no reason to ever use centimeters. 1000mm = 1m, 1000m = 1km, 1000g = 1kg, 1000kg = 1T But centimeters aren't timesable/divisable by 1000 to change units thus every construction site I've worked on has banned them to avoid confusion and I agree.