If you've had your Grobo for 1 year or more, you must replace your pH probe. 

Each probe contains a liquid inside that is necessary for it to measure pH. Over time, that liquid expires and the probe no longer gives accurate readings.

To complete a replacement, you'll need:

Please follow the steps in the video HERE to learn how to replace it. Once you've replaced your probe, you must immediately calibrate the new probe in the Grobo App.

Still have questions? Please see HERE for how to contact us.