HI758-11 Calcium Standards for HI758 Hanna Checker - Marine Water

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HI758-11 Calcium Standards for HI758 Hanna Checker - Marine Water

SKU: 208637
Performance
3 Review(s)
$17.00
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  • A must have! By on 8/8/2017

    You must have this in order to continually check the accuracy of your meter in order to eliminate any doubts about your the test on your tank water. Mine showed it was 5ppm lower than rated, so I adjust my final readings on my tank water sample.
  • Worked within its range! By on 12/8/2016

    It tested as it was advertised. There is a expiration date on the vials, which I didn't expect but makes sense if the standard has to be color specific. They store in a black plastic case that fits the box they come in so they can be protected from light and not fade I guess. The alkalinity and calcium are the same besides there different colors.
  • Excellent By on 9/18/2016

    Easy to use.