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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 (122 of 124)

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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Product Questions

Is the battery in this unit replaceable?
Question by: Dave on Jan 19, 2014 1:58:00 PM
Hi Dave,
It sure is. It uses a pair of button batteries that can be replaced fairly easily.
Answer by: Bulk Reef Supply on Jan 19, 2014 1:58:00 PM
I have this dual meter installed in my 4 Stage R.O. as recommended I am noticing a substantially higher levels of TDS in my R.O. system lately. Maybe 5 times what they were originally a year and a half ago now approaching 100... These levels are reflect straight out of the tap as well and post filter change... I have not changed my Membrane but it is a 18 month old Dow and my water production requirements are not large so it shouldn't be a problem.

My question is what is the best way to test ( Deionized Water) the meter and calibrate it if necessary?
Question by: Adam on Jun 21, 2015 12:05:00 AM
Great Question,
We don;t recommend calibrating the units as we have not found them to be out of calibration since we have been using them. The calibration steps would also need to occur in a laboratory environment. If your TDS coming out of the membrane is in the 100's there is most likely an issue with the membrane, which possibly needs to be replaced or a bacterial bloom in the housing.
Answer by: Connor (Admin) on Jun 22, 2015 6:08:00 PM

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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  • Very Nice Product By Eagle1 on 6/28/2015

    Works well, I haven't had an issue with it yet, I have the 1 in and 1 out, I disconnected the out due to misplacement of the inlet valve not in line with my unit, I had a small leak, as long as the out is working I am good.
  • Works perfectly By Craig on 6/26/2015

    Works perfectly, letting me know my TDS before and after my DI resin. I bypass the DI resin until my TDS is below 10 and then monitor both sides after that. Recommended.
  • Nice Unit By Eagle1 on 6/11/2015

    Installed this dual meter on my RO/DI unit today, I had to make up some different connections to get back to the supplied "T" on the in side but wasn't too much of a hassle, meter is correct on what my water is 120 going in and 0 coming out.
  • Easy and Efficient By Ed on 5/29/2015

    Took about 5 minutes to set up, easy install, easy to use. Everyone should have one!
  • I don't know why I didn't order this sooner! By Butch on 5/29/2015

    This product is easy to install and even easier to use. If you are in the market for an RODI, purchase this at the same time to take the guess work out of what your TDS is on each and every water change.
  • Does the job By phil on 4/4/2015

    I bought this already installed on 4 unit RO/DI system. First one stopped working after about 8 months. could not check if was batteries as was unable to find any batteries that I could replace. Fortunately after contacting customer support found out that it was still under warranty and they immediately sent out a replacement. Happy once again and kudos to customer support. The meter is a nice thing to have on my RO system.
  • 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.

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