This salt tester seems accurate and very easy to use. I checked my saltwater pool and it showed 3000ppm which is about what it should be. I don't have a gold standard for testing this tester, so I wouldn't use it in a situation where accuracy is important. But for testing changes in salinity over time and general measurements, it looks like it could be useful. The build quality is not the best. It's cheap plastic and the o-rings fall off very easily. I wouldn't count on water resistance at all.
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