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Got the fluval it actually gave not very accurate ph or nitrate readings red sea and hannas were very similar and fulval was off quite a bit so for me no go on fluvalSalifert seems to be the gold standard for the ones who can read it and use it consistently. Sadly, i am not one of them - never excelled in Salifert.
I use Hanna for alk, phosphate and nitrate and Red Sea for the rest.
Its not about what's best, it's about which ones works consistently for you
If you end up getting the Fluval, it would be interesting to hear more about your experience!!