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Osmotics Water Filters are fast becoming the leading brand within the water filtration industry. Our water filters and Reverse Osmosis systems improve water taste and quality by reducing impurities.
HM Digital Inline TDS Meter : DM-1
DM-1: In-Line Dual TDS Monitor
80.00 Grams
Calculated at checkout
DM-1: In-Line Dual TDS Monitor
DM-1: In-Line Dual TDS Monitor
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Product Description

The DM-1 is consumer friendly monitor measuring feed (input) water vs. product (output) water of a water filtration system at any time. This device is ideal for Reverse Osmosis (RO), Deionized water (DI) filtration systems that work well in variety of application such as drinking or potable water, Aquariums, Hydroponics and many more.

This TDS meter allows you to monitor your Reverse Osmosis system performance giving you peace of mind that everything is working as it should.


  • Displays TDS levels of the feed water and product water with in & out electrode probes.
  • Highly efficient and accurate due to its advanced microprocessor technology.
  • Auto-Off function conserves battery power. The unit shuts off automatically after 10 minutes of non-use.
  • Comes equipped with Quick-Connect T-fittings as shown.
  • Installs quickly and easily.
  • 3-digit LCD Display
  • Generic design fits all systems.
  • Dual Range 0-9990 ppm (From 0 - 999 ppm the resolution is 1 ppm. From 1000 to 9990 ppm, the resolution is 10 ppm, indicated by a blinking x10 image.)
  • Factory Calibrated


    • Range: 0-9990 ppm Dual Range 0-9990 ppm (From 0 – 999 ppm the resolution is 1 ppm. From 1000 to 9990 ppm, the resolution is 10 ppm, indicated by a blinking ‘x10’ image.)
    • Accuracy: ±2%
    • Conversion Factor: NaCl (avg. 0.5)
    • Cable Length: 24.5″ (including sensor)
    • Fittings: 1/4″ standard, also available with 3/8″ or 1/2″
    • Power source: 2 x 1.5V button cell batteries (LR44 or equivalent; included)
    • Battery life: approx. 1000 hours of continuous use
    • Size: 7.6 x 2 x 4.7 cm (3 x .8 x 1.9 in.)
    • Weight: 79.4 g (2.8 oz.)
    • UPC:891144000052


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    Product Reviews

    1. Just what i wanted – Rating 5

      Posted by Unknown24-04-2016

      Quick and easy. Much better than the portable pen type

    2. Essential bit of kit for an RO Unit – Rating 5

      Posted by Anonymous8-12-2014

      Easy to use and clear instructions. The In will show you how much contaminants there are going into the RO unit and the OUT should always read 000 showing that they have been removed. As soon as it reads 001 I replace the DI Resin as this maximises the life of the membrane within the RO unit.
      If you have an RO unit or are going to buy an RO unit then you must get one of these

    3. Great Monitor – Rating 5

      Posted by Kev Graham14-07-2014

      Very simple to fit with clear and concise instructions. Allows you at a glance to see the status of your water pre-filtered then with the press of a button to see your water purity AFTER filtration.
      A valuable accessory to monitor the efficiency of your RO Unit and better manage the changing of any filter material which could save you money by not wasting media whilst it is still effective

    4. The perfect accessory to your RO unit. – Rating 5

      Posted by AVD15-04-2013

      Simple to install and easy to operate.

    What is Reverse Osmosis?

    Reverse osmosis (RO) is a filtration method that removes many types of large molecules and ions from solutions by applying pressure to the solution when it is on one side of a selective membrane. The result is that the solute is retained on the pressurized side of the membrane and the pure solvent is allowed to pass to the other side.

    Reverse osmosis is most commonly known for its use in drinking water purification from seawater, removing the salt and other substances from the water molecules.

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