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 (126 of 128)

SKU: 200031
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Quick Overview

Why does BRS recommend this?


Using a RODI system without a TDS meter is like driving a car without a speedometer and gas gauge.  At some point you will end up in trouble.  With RODI systems it is TDS that you will want to monitor for performance and filter quality.  By using a dual TDS meter it will allow you to see your TDS readings in two places.  We will usually suggest putting one probe before the DI stage and one after the DI stage to show what your RO is producing for water quality and then how your DI is performing by removing all remaining TDS from the final product water.


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.


BRS 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
Does the meter have to be replaced at some point? I noticed today that the filters are needing to be replaced but I'm getting an output reading of 0.0.
Question by: Jeff Ostrowsky on Jan 23, 2016 9:31:00 AM
Great question!
The TDS meters on the units do not need replacement. In many cases they will last the life of the unit. It very well be that CO2 or other elements are reducing the DI resin faster than any TDS. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Jan 28, 2016 4:51:00 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.


BRS 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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  • Accurate Reading! By Tony on 1/13/2016

    This is the most accurate meter I have owned!
  • Can't go without By Anthony on 12/21/2015

    Works as advertised. Good to know when you're producing quality water!
  • Worth every penny By Corey on 10/21/2015

    Its too good of a price to pass on if you dont have something to read tds. Highly recommend it. Works like a charm
  • Great Product By Randy on 7/19/2015

    This works as advertised. Does exactly what I need it to do. Purchased this back in Dec 2014, and its still working perfectly.
  • 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.

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