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This triple probe meter comes standard on all MERO systems.  This probe allows for the monitoring of our system at the touch of a button.  Test incoming city water with TDS probe 1,  then tests after the RO Membrane with probe 2.  This will show how the membrane is performing.  Then with probe 3 we test after the DI Resin to make certain its producing zero TDS water for our use.

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  • Advanced microprocessor technology
  • Auto-off function shuts off after 10 minutes of non-use
  • 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: calibrated with a 342 ppm NaCl solution.


  • Range: 0-9990 ppm
  • Accuracy: ±2%
  • Conversion Factor: NaCl (avg. 0.5)
  • Cable Length: 24.5″ (including sensor)
  • Power source: 2 x 1.5V button cell batteries (LR44 or equivalent; included)


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