Review on 🐠 Qguai 9 in 1 Aquarium Test Strips - Saltwater Freshwater Pond Pool Spa Water Testing Kit: pH, Nitrate, Nitrite, Carbonate, Chlorine, Alkalinity, Hardness - Fast, Accurate & Convenient - 50 Strips by Clay Elmer

I have had an aquarium for over 20 years. Now that my little ones are old enough to reach out and understand, let's just say I'm having trouble with the aquarium. I bought them and tried two. The colors blurred and it was impossible to get an accurate reading cue* with the second. I ended up ordering regular ones because those didn't work. There is no information about the tank level, so I think it's universal. Don't buy these for your aquarium, I don't think they are accurate enough to read levels. Maybe it's just me, but I've never had problems with others.