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Are you talking about the one by Seachem? I think they work very well. I compared it with the Aq. Pharm. ammonia test kit to double check and the readings match with the Seachem one.
Yep. I know the toxic level is 5ppm but I cant remember the other ones. It said even if there is a tiny bit of ammonia like .1 it will have a greenish tint, so that should be ok too.