The Hanna checker works and it is accurate, however you need to be very, very diligent about test procedure and the vials need to be spotless.
What I do is;
- Cut open one of the reagent packs and make sure there is none stuck in the corners, etc. Fold so one long edge goes into a V shape.
- Turn on checker, fill vial with tank water. Wipe with a cotton towel to dry, then a microfibre towel to remove streaks/debris. When very clean, put in checker.
- When C2 comes I pull the vial, carefully put in reagent, shake (gently) for a 100 count. Re-do the towel thing, shake a few more times to get any bubbles stuck on the vial to rise to the top, then put it back in the checker for three minute countdown. Keep in mind to do all this you only have three minutes or the checker will power off.
After reading Myka's post, seems pretty similar.
I have had my complaints of this checker in the past, but since using this method and making sure the vials are spotless, it has been very consistent.
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