Hanna instruments, hanna checkers

[Myka]

There have definitely been a lot of complaints about the Hanna Calcium Checker, and plenty of praise for the Hanna Phosphate Checker. Murdoch brings up a good point that the alkalinity test is very simple (with any brand). I haven't tried any of the Hanna Checkers since I have been very happy with results of the different (and cheaper!) test kits I currently use.

My preferred test kits with second choice in brackets:

Calcium - Elos (API)
Alkalinity - Elos (API)
Magnesium - Salifert
Nitrate - API (Salifert)
Ammonia - API
Phosphate - D-D Merck

pH - handheld meter only, test kits are garbage.