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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Calibration of measuring devices using freshly prepared buffer solutions is an important part of producing accurate results and yet it is very frequently overlooked. Precision is important in Science; very similar to the way an athlete takes pride in their appearance when wearing a properly sized varsity jacket, there is. The quality of calibration will always show up in your results; whether you are taking short cuts in your style or in your data collection.