> I think saying either in this context is fine since it's perfectly clear

Context is just as relevant as units. It's clear that litres and grams are
what's meant by product labelling of eg "5L" or "300GMS". Even
"500GRMS" - please, splash out on an "A" to finish that off

One perennial irritant to me is the use of "on the Richter Scale" -

http://en.wikipedia.org/wiki/Richter_magnitude_scale

- probably for several reasons

The average person has no idea of what the Richter Scale means

There's no other commonly-used indicator of quake magnitude

Adding that phrase seems superfluous, viz a similar phrase is not
added to other reporting (eg "150 on the Miles Per Hour Scale)

I'd like to think my faxing and emailing to newsrooms whenever I
hear this has led to the now more-often useage of just "magnitude",
for example "a magnitude 7 earthquake)

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