Jeff Liebermann wrote:

If you parse the word into duro meter, it is
somewhat obvious that it refers to the
instrument, not the units of measure.

To me the intuition is the other way around:
durometer = instrument, as in thermometer,
hygrometer ...

Before you ask, zero durometer means that you
punched a hole in material under test and 100
means that the indenter needle didn't move.

OK, but wouldn't that also depend on the
thickness of the material? Or is "strength thru
thickness" a fine way of doing it?

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