Dimensional analysis is a superpower honestly. Even in a software engineering career it's saved me from massive issues quite routinely

The HP 48G / 50G provides incredible unit handling. My main use for it these days.

Any war stories?

Requests per second, bytes per request, bytes per second should all match up very closely under dimensional analysis or something is drastically wrong ;)

Little's law is another related phenomenon that is super critical. Measuring things when the units don't match has bitten me more than once.

Concur on Little's law