I have the aquar. Pharm. master test kit too. I have always had problems with the amonia test. Everything, and I do mean everything I test reads anywhere from .25 to .50 for amonia. It doesn't matter if i test bottled water, tank water or tap water, the amonia test never works. Everything else in the kit seems to work fine. I switched to the salifert amonia test but figured I would use up the rest of my aquar. Pharm. tests before I switched anything else.