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i bought the low range phosphate checker and every test i've done comes back as zero, i also have the red sea kit and the few times i've done the phosphate test with red sea its around .04. is the low range just not able to get that accurate or .04 is zero to the hanna checker?
should i buy the ULR checker instead or would it still show zero?
should i buy the ULR checker instead or would it still show zero?