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KH/GH test kit accuracy

5K views 4 replies 4 participants last post by  Hoppy 
You seem to be running low on reagent for the Nutrifin test kit, which suggests that it may now be too old. That will certainly reduce the accuracy of the result. But, Ray is right that unless you calibrate with a known set of standards you have to assume that any test is inaccurate to some unknown degree.
 
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