I bought a couple of Aquarium Pharmaceutical liquid drop kits. One for Ammonia and one for Nitrites. I screwed up and bought the freshwater/saltwater ammonia kit though. So I have to add 8 drops of 2 different solutions instead of just 1 solution in the freshwater only kit. Makes it kind of a pain. I also have trouble getting the right amount of water in the test tubes. They are so much longer than needed that you can't just tap the side to splash a little out like the test kits for our swimming pool. I went shopping for a nitrate kit today, and saw one (I think it was by Tetra) that had 2 or 3 different solutions and powder as well. Do you have to mix all of this stuff each time you test? If so, ouch!! Perhaps I am being picky, but I believe the easier it is to use, the easier it is to read accurately, the more likely a person is to use it on a regular basis. And when you are testing every day when cycling a tank, you come to appreciate such trivial things as ease of use. So what is everyone else using? Why do you prefer what you do? And what have you used in the past that you didn't like?