I have both Hanna checker one is dkh and one is ppm model both giving me wrong readings. I checked with my redsea it reads 8.4
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I do something similar to this. I use the fauna marin reference solution and test my test kit against it. So when I test the reference solution and it comes up with 9.0 dKh and the reference solution shows that it's really 8.5 then I know that my test kit is consistently .5 above what it really is. Another thing to compound this issue is that I've noticed that each time I open a new bottle of reagent I get subtly different readings from the last batch.Best way is to get the Hanna test standard. Test both and find out which is closer. Then keep testing till you get an average Delta. Apply that Delta when recording.
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I do something similar to this. I use the fauna marin reference solution and test my test kit against it. So when I test the reference solution and it comes up with 9.0 dKh and the reference solution shows that it's really 8.5 then I know that my test kit is consistently .5 above what it really is. Another thing to compound this issue is that I've noticed that each time I open a new bottle of reagent I get subtly different readings from the last batch.