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That's a good point. I just assume that every SR user does, or at least will, maintain their own razor...eventually.

Risking belaboring the point, if I may, a barber who daily shaves many different beard types, and maybe having only a few razors at his disposal, comes to mind.

While it's certainly possible that...

Hmmm...

I suppose the ultimate way to tell if a steak is done is to eat it.

Or you could use a thermometer for the temperature test.

A skilled chef can tell the differences from rare to well...