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I use red sea for Alk and Ca. I use the low range Hanna checker for phosphate. The little packets are kind of annoying and I would suggest buying the extra packets at the same time you buy the checker as you'll run through them pretty quickly at the start. But I've been very happy with mine and I think it's one of the best tests for low range PO4.
Is it always match with redsea in the number?

