🧪 JTT 9-in-1 Water Test Kit 100ct for Drinking Water, Aquarium, Pool & Spa - Best Kit for Accurate Water Quality Testing with Instant Results: pH, Free Chlorine, Total Hardness, and More Review

I love these water test strips! Great product that can test all types of water I want to test. The bars in this test set show 9 different endpoints. It's fast - 2 min and reproducible in 4 repeat tests. The colors are clear and barely visible.

I used it to test the water quality in an aquaponic system. The color code and corresponding pH test value on the bottle says: 6.0, 6.4, then 4.8, 7.2, 7.6. etc. It seems to me that 4.8 should be 6.8. Otherwise, the 4.8 color code is too close for comfort.

I have used them many times but the last batch was defective. It turned out that my tap water, which has a constant pH of 7.0-7.2, was below 6.0. It's easy to think the tank has a pH error when it doesn't, and accidentally make the tank too alkaline, which can kill your fish. I am farming 1 wild extinct species of fish, Monterrey Pied, and I just can't let this happen.

I used Tetra test strips and an API master test kit and 9 in 1 test to make sure the values were at least close to the same. General tests were total hardness, nitrite, nitrate and pH. The 9-in-1 streaks were consistent and significantly lower than the other two. I tested the pH in the calibrated solution and it didn't change color at all. I bought it for the metals (copper, lead and iron) but I can't trust it.