I test alk on the apex 4 times a day and salifert,hanna once a week all three are different today apex 7.9 salifert 8.4 hanna 8.9 . I had it just going with the apex. Not getting worked up anymore .
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That does stink! Makes you wonder what actually at! I would say pick one and keep it consistent at that. At least the range you are testing are all within good rangeI test alk on the apex 4 times a day and salifert,hanna once a week all three are different today apex 7.9 salifert 8.4 hanna 8.9 . I had it just going with the apex. Not getting worked up anymore .