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DM1 Dual Inline TDS Meter

Calculated at checkout

Product Description

DM1 dual inline meter displays TDS levels of feed water and product water. 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 two locations with in & out electrode probes.
  • 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 two 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: 2.8 oz.

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Product Reviews

  1. Works as expected 5 Star Review

    Posted by on 16th Mar 2018

    The headline says it all. The DM1 looks, feels, and works just like it is supposed to. Simple to install, simple to use. Quality.

  2. Simple Effective TDS Meter 5 Star Review

    Posted by on 30th May 2016

    I've been using the DM1 Dual Inline TDS meter for about a week. It's simple, effective, and (most important for me) permanently attached to the RO case so I don't have to worry about losing it.

    Easily hooked up and ready to read nstantly.

    I'd definitely buy it again, but it's pretty sturdy, so I'm betting I won't have to.

  3. Awesome Tool 5 Star Review

    Posted by on 25th Oct 2015

    This is an awesome tool. Just turn it on and watch the TDS change. See incoming TDS and outgoing TDS at the flip of a switch. Easily determine RO system efficiency.

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