Bought at a homebrewing conference. Compared to my laboratory water test results, some points are correct, others are not. I had many questions and went back and forth with the salesman/technician who sold it to me until he stopped responding. I had high hopes for this product and while not a waste of time, it didn't give me any results to test either. Unfortunately, it's gathering dust along with other items in the homebrew world that "almost" work.
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