HM Digital TRM-1 Triple Inline TDS Meter

Three sensor TRM-1 TDS monitor that is ideal for checking TDS levels at 3 different points.

As low as £37.20 £31.00
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This HM Digital TDS meter allows you to take 3 different readings, this makes it ideal for window cleaners and aquarists that want to monitor water input TDS, reverse osmosis output from the first DI stage.

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.
  • Auto-off function conserves battery power. The unit shuts off automatically after 10 minutes of non-use.
  • Factory calibrated with a 342 ppm NaCl solution. Meters can be recalibrated with a mini-screwdriver.
  • Installs quickly and easily.


  • Range: 0-9990 ppm 
  • 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.)
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