A lot of people are completely oblivious to how to use a ph meter the proper way.
90% of problems with growing marijuana and weed stem from issues with pH and part of the problem is that people do not use them properly.
I have gone through dozens of pH meters in my history of growing and it took me a while to understand why they need to be stored in a proper way.
This video summarizes the scientific reasons why you need ion rich storage solutions such as KCL to extend the lifespan of your meters.
Make it your got dam self tutorial: https://youtu.be/IMouPp7x-R4