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Titanium S3 Digital Inline TDS Meter with Three Probe Sensors - Auto Aqua


Item #: CV2917

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The Titanium S3 (TDS-300S) has been designed to monitor water quality of RO/DI systems, with three corrosion resistant titanium probes that ensure accurate readings. The probe easily installs into RO or RODI systems with its included 1/4" T-fittings, while the S3`s magnetically coupled controller allows it to install on a metal frame.


  • Titanium corrosion resistant probe
  • Magnetic mount
  • Push Connect Union Tee for easy installation
  • Calibration-able for accurate results
  • Auto shut-off after 3 minutes
  • Small and compact design
  • Low battery indicator


  • Range = 0 - 999 ppm
  • Resolution = 1 ppm
  • Accuracy = +/- 2%
  • Power = 1 x CR2032 Lithium Battery
  • Battery Life = 1 year


  • 1 x Digital Inline TDS - Titanium S2
  • 2 x 1/4" Push Connect Union Tee

Manufacturer information

AutoAqua, one of the outstanding intelligent aquarium providers in the world, aims to design and manufacture small, safe and smart automatic aquarium products. To realize aquarists’ dreams, we also develop an aquarium interactive system based on WiFi connection, which enables aquarists enjoy an easy aquarium life with enormous fun.

Smart ATO and Smart ATO micro are a unique top-off system which features easy installation and maintenance. They employ the Quick Security Technology providing real-time protection to prevent any failure situation. The Smart ATO comes with the patented contactless digital sensor that monitors and automates refilling evaporated water. The Smart ATO Micro is designed especially for nano tanks has an incredibly small sensor uniquely coupled with a magnet.

Smart AWC Touch, one of their newer products, is an automatic water change and auto top off all-in-one system. It reduces aquarists’ time and effort doing water changes and topping off their tank. All a hobbyist needs to do is set up optical level sensors and pumps and program their water change process using an included LCD touch panel. Then you can perform water changes automatically according to your desired frequency and refilling speed. Smart AWC Touch also employs Quick Security Technology providing real-time protection to prevent any failure situation.

5 Stars


Reviewed on
December 07, 2019

Yes, I would recommend this.

Worth every Penny

Pros: Bright easy to read display, Three probes, Can be calibrated

Cons: You will need to have somthing to stick it to the wall with.

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.
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.
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 are parallel in 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.
I am very happy with this unit and feel it was worth every penny spent.

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