Excellent This TDS meter is accurate enough to tell the difference between 0 and 1 dissolved solids in the water column. A TDS reading below 40 turns green and anything over 40 turns red, but you can't know if the water is safe or not without knowing what the 40 total dissolved solids reading gives. The only way to ensure you have safe drinking water is to have the water tested for its exact contents and surprisingly this can be done for free in many places such as your city or wherever you get it Do you want to sell a water purifier? .If you are using this to monitor your reef system and many of them, aim for 0. Anything Above 0 Every time you add water that evaporates, you also add back unloved solids that accumulate in your aquarium on a daily basis. or the body, for that matter, and it could be anything from nitrates to phosphates or something worse. I've had many TDS meters over the years. My hobby is keeping reefs indoors and growing corals for talk and salt water will rust the sensors of all TDS gauges after a few years. It was one of my favorites as the screen lights up and is easy to read and also very accurate. They also have a temperature sensor that you can toggle between Fahrenheit and Celsius. 5 Star Product - Thumbs Up! β
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