DM-1 In & Out digital display TDS Tester | Inline TDS Meter | HM Digital

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Brand HM Digital

Note:  This model requires a tee fitting (sold separately) for installation.    Recommended Fitting for 1/4" Tube: F-4UT44QC, or for 3/8" Tube:  F-6UT64QC

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

The DM-1 is a user-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.

  • Installs quickly and easily
  • 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: our meters are calibrated with a 342 ppm NaCl solution. Meters can be recalibrated with a mini-screwdriver.
  • Equipped with Automatic Temperature Compensation (ATC)

DM-1 Specifications

HM Digital Part #: DM-1


0-999 ppm and 0-9990 ppm
Accuracy: +/- 2%
Conversion Factor: NaCl (avg. 0.5)
Cable Length: 24.5" (including sensor)
For use with Fittings:   1/4" quick connect (sold separately)
Power Source: 2 x 1.5V button cell batteries (LR44 or equivalent; included)
Battery Life: Approx. 1000 hours of continuous use
Size: 3" x 0.8"  x 1.9"   (7.6cm x 2cm x 4.7cm)
Weight: 2.8 oz  (79.4 g)

*Dual Range:  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.)