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TRM1 Tri Inline TDS Meter

Calculated at checkout

Product Description

TRM Tri inline meter displays TDS levels at three locations - Finally there is a meter that fits the needs of RODI system owners!  Install probes on the feedwater, RO water, and DI water tubes to get a complete picture of how each stages is affecting TDS.  Shuts off automatically after 10 minutes. Dual range 0-9990 ppm (from 0-999 ppm with resolution of 1 ppm; from 1000 to 9990 ppm resolution is 10 ppm). Factory calibrated with a 342 ppm NaCl solution. Can be recalibrated with mini-screwdriver. Includes two quick connect fittings designed to insert the probe in 1/4", 3/8", or 1/2" tubing.


  • Displays TDS levels at three locations.
  • Highly efficient and accurate due to its advanced microprocessor technology.
  • Auto-Off function turns unit off after 10 minutes of non use to conserve battery life.
  • Dual Range 0-9990 ppm (From 0 - 999 ppm, reads in increments of 1 ppm. From 1000 to 9990 ppm, reads in increments of 10 ppm, indicated by a blinking 'x10' image.)
  • Factory Calibrated: with a 342 ppm NaCl solution. Can be recalibrated with a mini-screwdriver.
  • Includes three quick connect Tee fittings.
  • 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" 3/8" or 1/2".  Make your selection above based upon the outside diameter of your tubing.
Power source: 2 x 1.5V button cell batteries (LR44 or equivalent; included)
Battery life: approx. 1000 hours of continuous use
Size: 3 x .8 x 1.9 in.
Weight: 4.0 oz.

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Product Reviews

  1. Works Great. Easy to Set Up 5 Star Review

    Posted by on 16th Sep 2020

    Once you understand the flow of your RO/DI system this meter couldn't be easier to set up. Buckeye was also available for encouragement and confirmation. Great company to do business with!

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