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Dual Inline TDS Meter DM-1 - HM Digital

SKU: 200031


  • 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.
  • Must have item on RO/DI system By Rick on 4/18/2014

    This meter is a great addition to any system. Much easier then a pen type checker. To have confidence in the water going into your tank you need to know if the filter is running as it should be. With this you will know in seconds.
  • Why didn't I have one when I started!? By TriggerThis on 4/13/2014

    A must have!
    I didn't have one, almost crashed my tank putting 30TDS top off water in it every day because I didn't know my DI was exhauseted.
    Don't have to worry any more
    Literally takes 6 seconds to install
    Great product
  • WORKS WELL UNTIL CALIBRATION IS NEEDED By NONE on 4/10/2014

    GOOD LUCK CALIBRATING FOR THE AVERAGE JOE. AT THIS POINT IMO IT BECOMES DISPOSABLE. FOR THE PRICE AND GETTING SEVERAL YEARS USE IT IS WHAT IT IS.
  • put a few on your rodi system By Chicago on 3/25/2014

    I love these things. I use two of them on my system. Use for
    1. supply water going in
    2. water after the pre filters and after carbon
    3. after the reverse membrane but beofre the di cartridges
    4 last one after the di cartridges to let me know how the final water is.

    so easy and great to monitor.
  • This works really well By Bob on 3/3/2014

    Hooked this up to my older RO unit and was able to see how well the membrane is performing. Its especially amazing to see the difference between the input and output.

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