An excellent tool for testing the quality and purity of drinking water for TDS (Total Dissolve Solids). I used it to compare my pre-filtered tap water to my filtered water. There was an improvement in filtered water. It also helps you know if your filter is working as intended. This tester helps ensure the quality of the water you drink and gives you peace of mind. Very easy to use and comes with an extra battery. I also like the color and it's fun to use. I highly recommend this tester.
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