I'm going to guess, and this is truly a guess, that it's referring to parts per thousand. If that's the case, 30.1 is a bit low - I'd aim for 34-35 PPT.
I'm going to guess, and this is truly a guess, that it's referring to parts per thousand. If that's the case, 30.1 is a bit low - I'd aim for 34-35 PPT.
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