Review on 🧪 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 by Mariah Garrett

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.