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The DM-3 is a commercial-grade EC/TDS monitor measuring EC/TDS feed (input) water vs. product (output) water of a water filtration system at any time. DM-3 has a large backlit screen that you will be able to see the readings in dark environments. With its shielded cables and diagnostic messaging this robust device is ideal for Reverse Osmosis (RO), Deionized water (DI) filtration systems that work well in applications such as drinking or potable water, Water treatment, Aquariums, Hydroponics, and many more