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Dual Inline TDS Meter DM-1 - HM Digital

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Dual Inline TDS Meter DM-1 - HM Digital

98% Recommend this to a friend (116 of 118)

SKU: 200031
$29.99
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Quick Overview

The DM-1 Dual Inline TDS Meter from HM Digital is one of the most important reverse osmosis accessories. This tool monitors the TDS of your reverse osmosis system in two places and lets you know exactly how the system is performing.



BulkReefSupply.com suggests installing the dual TDS meter post membrane and post DI stage. These two readings will notify you when it's time to change the RO membrane and DI resin. This unit features a digital display and comes with two 1/4" John Guest Quick Connect Tee's. As with all HM-Digital products, the DM-1 comes factory calibrated.


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Previously Asked Questions

  • by Dave on January 19, 2014, @1:58 PM

    Is the battery in this unit replaceable?

    Bulk Reef Supply Hi Dave,
    It sure is. It uses a pair of button batteries that can be replaced fairly easily.

    Do you find this question helpful?  Yes   No

Full Details

The DM-1 Dual Inline TDS Meter from HM Digital is one of the most important reverse osmosis accessories. This tool monitors the TDS of your reverse osmosis system in two places and lets you know exactly how the system is performing.


BulkReefSupply.com suggests installing the dual TDS meter post membrane and post DI stage. These two readings will notify you when it's time to change the RO membrane and DI resin. This unit features a digital display and comes with two 1/4" John Guest Quick Connect Tee's. As with all HM-Digital products, the DM-1 comes factory calibrated.

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  • Must have item By Travis on 3/9/2015

    This is definitely an integral part to an RO/DI system. I like being about to know with a flip of the switch what my TDS is after each filter segment. Easily indicates when a filter needs replaced.
  • THIS IS A MUST HAVE By MARY on 12/8/2014

    Really simple to install and operate.
  • Quality TDS Meter at a Great Price By Davide on 11/21/2014

    This product is easy to install and and displays an accurate reading. With the push of a button, it displays what your current reading is and then shuts off after a couple min.

    I've had this product since the beginning of 2014 and I haven't had to perform any maintenance on it.
  • Added a second to my rodi system By Jonathan on 11/10/2014

    I added a second tds meter to monitor the incoming water supply and waste water for use in other, less sensitive freshwater tanks. Very easy to add these, just cut the existing tubing and install this inline.
  • Works well By Kyle on 11/4/2014

    These meters work well, continually updating the reading. I like to place mine after the ro membrane, and after the di resin. I find that the reading after the membrane is around 6-7, and after the di is 0. I have found that the di resin will continue to produce 0 tds water for a short time after the color-changing resin changes color.
  • Great tool By June2881 on 10/16/2014

    I did not have a tds meter installed to my RODI system when first starting out with my reef tank. After 4-5 months of excellent water parameters I suddenly had a huge phosphate spike. After realizing the problem was my RODI filters expiring I added this meter and never looked back. Excellent and very important tool.
  • Usefull TDS Meter By Mark on 9/29/2014

    I have this meter testing the water coming out of my membrane as well as the water coming out of my DI resin. It is very accurate and helpful. When the time comes where it need to be calibrated, the price point is good enough to purchase another.
  • Helps to take the guess work out By Travis on 8/19/2014

    Very easy to install and even move around if you are wondering what each area is doing. Changed mine over to the discharge side just to see what flushing does and I will tell you that it is a good idea to flush your RO before and after each use it does help. I only have about 190 TDS going in but while I'm flushing I have seen over 400 TDS coming out. This is a must have for anyone with an RO/DI unit.
  • Good product By emdrn05 on 5/19/2014

    I'm only giving this a 4 because the directions for installing it were lacking. Once I got it hooked up it seems to be working well. Definitely need to have one on your filter.
  • Must have By Eric on 5/8/2014

    You need this. Takes the guesswork out of filter replacement. Really simple to install and operate. Very nice for the price.
  • Great product By Richard on 4/20/2014

    Easy to install, gives a simple quick way to monitor your filter performance.
  • How Can You Not Have One By Austin on 4/19/2014

    how do you know what your system is doing are you at 0 TDS? the dual meter tells you what is going in to your DI canister and what is coming out. No more Hoping my RO/DI unit is working right.

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