I like the dip strips, but the problem is that once you break the seal on the package, the accuracy of the tests gets worse and worse as time goes by. They are good if you need to do a whole bunch of tests all at once, but thats it. I had a bottle of them for about 2 months. They were really accurate when compared to the results of my liquid tests, but after about 3 weeks they started giving me readings for nitrates when I had none.
If you are serious about the hobby, get the liquid tests. I recommend Salifert and Aquarium Pharmaceuticals...both of which I use. Don't let people tell you Salifert is too expensive, you can find them online for $10. :joy: