Sorry, but you need to read the directions then ;op They are more than
accurate enough for what we are dealing with here. There is no need to
spend $100 on a lamotte test when we are not in a laboratory setting. And
there are no digital meters for nitrate.

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Margolis
http://web.archive.org/web/200302152...qs/AGQ2FAQ.htm
http://www.unrealtower.org/faq