APEC Water Systems TDSMETER Water Quality TDS Meter Tester, 0 to 1999 Measurement Range for Better Accuracy, 1 ppm Resolution

This tester works fairly well at just testing how much particulate is in your water. It obviously doesn't tell you whats in the water, but if it tests super low near zero, then you are drinking very clean and most-likely reverse osmosis water. I tested the water all around my work one day and now know which areas are safe for drinking. I let my close friends know which water is safer for drinking and they appreciated that. Some water tested very high, like 200 ppm which is probably full of things that will kill you. I enjoy testing all my water and filters and this tester makes it easy to do.

Mide la cantidad de solidos disueltos en el agua. Se supone que el agua para beber debe tener entre 300 y 500 TDS para ser aceptable, y menos de 300 TDS es excelente. El agua e-pura por ejemplo, marca menos de 20 TDS, el agua de la llave en mi colonia marca 370 TDS. Atención! este aparato no mide la pureza del agua, solo la cantidad de solidos disueltos, no puede asegurarte que tu agua no contenga bacterias o viruses.

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I've had home RO water filters for over 20 years. I just recently found out about this testing. I asked AI how to know when to change filters. This tester is it. I typically change my filters every few years. I can probably go even longer, now that I know how to test the tap water and the filtered water. This will reduce the operating costs (Filters) increasing the value of the RO System. Tester is very easy to use. I chose this one because its made by the manufacturer of my RO system. Good Quality. I just leave it by the RO unit under my sink (where I keep the special filter wrenches).