Do these things even work?
I have wondered the same thing. I have read a lot of posts that people are using them. I would rather test myself & know it's working.
I think the question would be how accurate are they? Ammonia is such danger to fish that I'd rather get out the ol' test tube kit and do it myself.
Main question is why do you need it? There is really no reason to test an established tank.
They work, but by the time you are in the danger zone, the fish may have died! I used one when monitoring a tank having cycling problems just to give me a visual clue regarding the tank's status. It was faster to leave it in the tank and visually check it multiple times/day than it was to run the API liquid test for ammonia multiple times per day. NOT super-precise, but a good trend indicator.
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