AutoAqua Titanium One - Inline TDS Meter

For anyone serious about producing quality RO/DI water for their reef tanks, AutoAqua now has four great TDS meter options built on a compact, feature-rich, and easy to install platform! A TDS meter can not only provide peace of mind in monitoring your final product water, but it can also clue you in to when it's time to replace filter media. The Titanium One model features a display with the probe built-in, for simple installation on any 1/4" RO lines to provide quick readings at the spot of installation. This could be great for installing near the water source or final product collection lines where they may be remote from the RO/DI unit itself.


The Titanium series of TDS meters from AutoAqua are the smallest inline TDS meter in the hobby, making it very easy to find a spot to mount the display, and as the name would suggest, the TDS probes have titanium conductors, which provide great longevity and protection from corrosion. In addition, each Titanium TDS meter features a big backlit LCD display that activates with a single button push, giving you quick access to water quality readings. They also include push-connect union tees with each meter for fast and simple installation on your system lines. 


To conserve battery life, the unit will turn off automatically after 3 minutes when not in use. They use 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. 


  • Backlit LCD Display
  • Simple installation with a 1/4 in. push connect union tee included
  • High quality titanium probe
  • Compact design
  • Auto-off function
  • Calibratable
  • Low battery indicator


  • Probes: 1
  • Range: 0-999 ppm
  • Resolution: 1 ppm
  • Accuracy: +/- 2%
  • Power Source: CR2032 battery
  • Battery Life: Approx. 1 Year


  • Titanium One (Model TDS-100) Inline TDS Meter
  • Battery
  • 1/4" Push-Connect Union Tee