+1 I think those are pretty good #'s for Hanna testers. They are only advertised +/-5% accurate and I would be very surprised if they are really that accurate.
Who knows how accurate the checkers really are , however keep in mind that the regular checker is +\-5% ppm , whereas the ultra low range phosphorous checker is +\-5% ppb which is more accurate.
03-28-2014, 10:23 PM
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