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AutoAqua Digital Inline TDS - Titanium S3

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AutoAqua Digital Inline TDS - Titanium S3

Are you tired of big, boxy, hard-to-read TDS meters? So are we! That’s why we built the AutoAqua Titanium Series TDS meters. They are small, easy-to-use, and have a big bright screen to make checking your TDS fast and easy. 

The Titanium S3 also has a magnetically coupled controller to make it easy to pick up and stick back on the metal frame of your reverse osmosis system. There is no other TDS meter on the market like it!

The Titanium S3 features three titanium probes, which provides excellent protection against corrosion, to measure the Total Dissolved Solids (TDS) in your water. You can put one probe after your source water, another after your TFC membrane, and the third after the DI catridge. 

With a single push of a button, you’ll get an accurate reading of the TDS in your water! Push the button a second time to check TDS using the second probe. Push it again to check with the third probe. It’s so easy!

The reason hobbyists measure TDS is to ensure the water produced by their reverse osmosis (RO) or reverse osmosis/deionization (RO/DI) system is safe to use in an aquarium. 

The Titanium S3 TDS monitor can be used to check the quality of your inlet and outlet water to help you determine when it’s time to replace the cartridges in your reverse osmosis system. This is the most common application for a TDS meter in our hobby and the Titanium S3 is ideal for the job with an accuracy of +/- 2%. You’ll know precisely when to replace your carbon block, DI resin, or TFC membrane to ensure your aquarium water is pure and so you aren’t throwing away good cartridges prematurely.

It’s super easy to install, too. A ¼” push connect union tee is included to make setup a breeze. You can calibrate the Titanium One to ensure long-lasting accuracy. 

To conserve battery life, the unit will turn off automatically after 3 minutes of non-use. The battery is not proprietary, either. The Titanium S3 uses a common CR2032 lithium battery so when it comes time to change it, you should have no problem finding a replacement. Under normal use, the battery should last a year or more! There is also a low battery indicator on the display so you’ll never be left high and dry.

Check out these awesome features:

  • Simple installation with a ¼” push connect union tee included
  • High quality titanium probe
  • Small and compact design
  • Auto-off function
  • Can be calibrated
  • Magnetic mount
  • Low battery indicator


The Titanium S3 TDS-300S includes:

  • Digital Inline TDS - Titanium S3 x1
  • ¼” Push Connect Union Tee x3


Titanium S3 by the numbers:

  • Range : 0-999 ppm
  • Resolution : 1 ppm
  • Accuracy : +/- 2%
  • Power Source : CR2032 Lithium Battery x1
  • Battery Life : 1 year


Product code: 8311
Item No. TE-CV-TDS300S

1 Review

  • 5
    Execlent Meter

    Posted by Terry on Dec 7th 2019

    I purchased the Titanium S3 Digital Inline TDS Meter to replace the existing two probe meter that came with my RODI unit. I was looking something that was easy to read and had three probes. This meter was spot on. <br>The meter has three test probes so you can measure TDS on the input water, RO membrane, and output after the DI resin. By doing this you can quickly tell when you need to replace your RO membrane or perhaps you color changing DI resin wasn’t changing color that way it should. The real win for me was the bright easy to read LED. It really draws your attention to the TDS reading. Its like a beacon when the output reads anything other than ZERO. <br>The meter was well packaged, and each probe was capped with rubber caps to protect them in shipping. The probes also have an alignment mark on the side so when inserting them into the T-fitting you can easily verify that they aligned correctly the water stream. (the directions show the mark and how it is aligned.). the install was simple and took me perhaps 10 min and most of that was routing the wires. <br>The meter has a magnet on the back to mount the unit. If your RODI system uses an aluminum frame, then you will either need to affix a metal plate or add Velcro. <br>I am very happy with this unit and feel it was worth every penny spent. <br>