Hanna Colorimetric Checkers for Alk and Ca? F! yes!!

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If they are anything like the Hanna Phosphate Checker, the will be no quicker than Salifert test kits. More accurate maybe, but no quicker.

I expect these Hanna checkers will be most useful for those assays which would otherwise rely on visual judgment of colour gradation eg. for a nitrate test. For a test which can be done through titration-based colour change eg. calcium and alk tests, I don't see the benefit of the the Hanna checkers.