HM Digital® DM-1: In-Line Dual TDS Monitor

A TDS monitor, like the HM Digital® DM-1 TDS Monitor, is a vital part of any RO/DI system.

It plays a major role in ensuring that your system is performing at it’s best and continues to do so. It will alert you to when it is time to replace RO membranes and DI resin as well as ensure that the production water you are placing into your RO storage container is of the best quality possible with a 0 ppm TDS reading. Without a monitor, it is all just guesswork.


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SKU: HMD-DM1-TDSM Category: Tags: , ,


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), Deionised water (DI) filtration systems that work well in a variety of applications such as drinking or potable water, Aquariums, Hydroponics and many more.



  • Displays TDS levels feed water and product water with in & out electrode probes
  • Efficient and accurate with advanced microprocessor technology
  • Auto-Off function conserves battery power. (Shuts off automatically after 10 minutes of non-use)
  • Factory Calibrated: Meters are calibrated with a 342 ppm NaCl solution. Meters can be recalibrated with a mini-screwdriver.
  • Comes equipped with Mur-lok® Quick-Connect T-fittings
  • Installs quickly and easily



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.)
Conversion Factor:NaCl (avg. 0.5)
Cable Length:62cm (including sensor)
Fittings:1/4″ standard push-fit
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
Weight:79.4 g (2.8 oz.)
UPC: 891144000052


Click here to download the HM Digital® DM-1 – Manufacturer’s User Manual

Additional information

Weight.09 kg
Dimensions15 × 11 × 2.5 cm


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