I use elos for ca, alk and mg and find the kits to always be very consistent. I suppose I never know if they're accurate but i think water consistency trumps having your levels at precise spots anyways. these kits are very easy to use and my eyes have no issue at all detecting a colour change. kits that have you comparing colours stink i think but these have distinct endpoints.
I bough the phosphate checker and used it once. it read 0 which seemed unlikely to me and I haven't bothered to use it since.
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