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What's a Hanna Checker?Astrid.
I use the aquarium test kits (pH, kH, GH) and have found they work well. That is to say those readings have been inline with my sasmples taken to the dealer.
I like the ph meter linked above and checked it out. My only concern is it seems like it might need as much maintainance as the spa to kee it right. I'm talking about keeping it wet when not using it, keeping the buffers and chemicals stocked, etc. Is it one of those things that gets easy after a few times?
Yep, looks like Taylor kit for me as well. Also, stopping by the pool store for a free test every couple weeks is easy enough. If it was a matter of pouring water into a meter and getting a reading, ok. Calibrating is a word that scares me, and simplicity is one that excites me in my busy life.