DM-2 Commercial Dual In-Line TDS Meter

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DM-2 is a robust heavy duty, dual probe TDS meter suitable for use in a commercial water system. Suitable for use in aquatics, hydroponics and similar systems needing close scrutiny of water quality.

We offer this testing meter with a range of fittings, including:

  • Standard 1/4" Fittings - "No Fitting" option on dropdown
  • 1/2" Pushfit Fittings
  • 3/4" Pushfit Fittings
  • 15mm Fittings
  • 1/2" Barbed Fittings


  • Highly efficient and accurate due to its advanced microprocessor technology
  • Displays TDS levels of the feed water and product water with in and out electrode probes
  • Auto-Off function conserves battery power. The unit shuts off automatically after 20 seconds
  • Dual range; measures from 0 - 999 ppm, with a resolution of 1 ppm. From 1,000 to 9,990 ppm, the resolution is in 10 ppm increments, indicated by a blinking 'x10' image
  • Factory calibrated, our meters are calibrated with a 342 ppm NaCl solution. Meters can be recalibrated with a mini-screwdriver
  • Comes equipped with 1/4 inch Mur-lok® quick connect T-fittings. Also available with 3/8" or 1/2" fittings at an extra cost.
  • Installs quickly and easily

Differences from the DM-1

  • Designed for commercial/industrial applications
  • Stronger, water-resistant casing
  • Calibration can be done individually or simultaneously on each line
  • Improved design, including an extra large, easy-to-read LCD display
  • Longer, waterproof, shielded cables
  • Variable mounting bracket

Technical Specifications

  • Range: 0 - 9,990 ppm 
  • Accuracy: ±2% 
  • Conversion factor: NaCl (avg. 0.5)
  • Cable length: 46" (including sensor) 
  • Calibration: Factory calibrated to NaCl 342 ppm. Re-calibration can be done separately for each line, or simultaneously for both 
  • Power source: 2 x AA batteries (included) 
  • Battery life: Approx. 12 - 18 months 
  • Size: 11.6 x 6.8 x 1.8 cm (4.6 x 2.6 x 0.7 inches) 
  • Weight: 201.3 g (7.1 oz.)
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