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I beleave you can store it in 4.0 solution but just tap water is ok but hanna says 4.0 and bluelab says tap water as i just got myself a bluelab combo meter and that says about the probe it dries it dies lolHmmmm. The instructions in the package said to rinse with distilled water after each use, then store in storage solution.
I just did some general research on pH pens and you are definitely correct. It seems the manual I got with the pen is different than the manual that Milwaukee has online. The manual with the pen says to never store it in 7 buffer solution, but the online manual says to do exactly that. Odd.
Pen is calibrated and reading correctly in 7.0 and 4.0 so hopefully no harm done. Thanks for the insight.