Test kit poll

[Coleus]

Originally Posted by whatcaneyedo

pH is a tough one for test kits. Why not just use a pH monitor or controller? Theres a used one for sale used right now: http://www.canreef.com/vbulletin/sho...hlight=monitor

There are things I dont like about all of the test kits available to hobbiests. I've yet to see a study done that compares them for accuacy againts lab grade testing solutions/equipment so I dont think there is a 'best'.

Well I have neptune ph monitor probe and it record 7.7 :-(. Ok, I just test my ph with all test kits i have and here is the result my Salifert ph test say 8.2, api ph test say 8.4 and IO test says 8.2

This is driving me nuts. Ether i got a broken ph probe or all my test kits are junk. Your thoughts? Btw, is it true that you have to replace ph probe after one year usage?