I'm really confused why the reputable Hanna company is selling this when it obviously doesn't work? I was skeptical because of the bad reviews but that was a mistake. Luckily I have another set to compare. My actual reading in freshly mixed salt water is around 1300ppm. This tester tells me it's around 1700, or it just flashes 1800, which is its maximum. Absolute waste of time and money.
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