I tested water in 3 new buildings and the water was good and when I tested water in an old building, I received Red. It seems like your device is accurate.
D.T, Japan
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since our new neighbors started to use our water source, we have suffered from unexplained pain. The TestDrop Pro has consistently shown that our incoming water is very bad.
T.G, U.K
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I tested tap water and it was red, then I tested my filter's water and it was blue. The TestDrop Pro gave me the evidence that I needed that my filter was working properly.