When I first got my TDS meter I just calibrated it with RO/DI and figured I was fine. Long story short, I ran into issues where I got very, very different readings than my old swing arm hydrometer. I took it to my LFS and tested the water there but didn't get a reading that they keep their systems at. The problem appeared to be salt water buildup on my meter. Now I calibrate with this solution every now and then and know for sure that I'm fine.
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