Review on capetsma 9-in-1 Aquarium Water Quality Testing Kit - pH, Nitrate, Nitrite, Carbonate, Hardness, Chlorine, Alkalinity, Iron, Copper - Ideal for Freshwater, Saltwater, Pool, and Pond Testing by John Twardowski

We bought them for the same reason everyone else did: convenience. Well that was a mistake and we have dead fish to prove it. We just got home from Petsmart with API test kits that use solutions that are added to test tubes and found that at least a few things had toxic levels, but we were completely unaware beforehand because these test strips don't work. . The pH was not out of range at all and nitrite was so difficult to read on these strips that we thought it was fine, but the drops clearly and simply showed us that they weren't either. I can't help but think that if we had used the Drop API from the start we wouldn't have lost all those fish. Although these strips "test" 9 things, one of them is not ammonia, which seems to be very important when testing an aquarium.