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.
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