Mine sits upright in a glass in 7.0 PH solution. Put an inch in the bottom and add a bit as it evaporates. Also let’s me know it’s in calibration just by putting it back. Maybe $10 per year for the solution, dump and refill every once in a while to be sure PH solution is stable. The crazy storage solution I had so many salts in it as it evaporated the bottom of the meter crust up.
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