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I can't read the colors of the API GH test.
Isn't it just blue and yellow?

gH and kH test kits work by titration, so there should only be two colours...
 

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i heard Lamotte are the most accurate. I use API freshwater as I got it on sale.
Indeed, Lamotte test kits are the best, but are extremely expensive. We don't really need that kind of accuracy, but they are nice to have.

Test strips are inaccurate.
+1. Test strips are notoriously prone to poor storage conditions.
 
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