http://www.grindosonic.com/ make such equipment.
We've got one of their set-ups. Works very nicely provided you have big
enough samples. (We often don't, which is a bit of a bummer, but there you
Not hugely expensive, for lab kit - if you want to do more than a few tests,
it might be worthwhile to buy one given what commercial rates are likely to
be for doing any sorts of tests (no, I don't get a commission!). Or they
could point you at someone who has a set in the US.
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