fresh buffer solutions for calibration
if you’re not using fresh buffer solutions for calibration, they can give dodgy results. I started checking mine against two or even three points. I actually upgraded to a more solid model I found browsing some lab gear, and the difference was night and day. If you’re looking for better options, I found some really decent stuff under https://gentaur.co.uk/laboratory-equipment/ that helped me get more consistent results.
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I remember when I helped a friend in his chemistry class project — he had to measure water quality from different sources around town. We were hiking with a pH meter in our backpack, stopping near rivers and garden taps. It was less “lab” and more “road trip,” and let’s just say, we learned that equipment doesn’t like being knocked around all day in 35°C heat. Good memories, though.