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.


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