YSI 60 - Manual (Page 19)

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5.3 pH Sensor Storage
For short term storage between measurements in the field (up to one week), place the probe in
the transport chamber in the side of the instrument case. Make sure that the sponge inside the
chamber is wet (tap water).
For long term storage (over one week), place the probe in the storage bottle (provided)
containing a mixture of 50% pH 4 buffer and 50% 1.5M KCl. This will assure the fastest
possible pH response. If this mixture is not available, storage in tap water is the next best choice.
Do NOT store the probe dry or in distilled or deionized water.
NOTE: After storage in the pH 4/KCl solution described above, place the probe in the transport
chamber in the side of the instrument case or soak the probe in pH 7 buffer for 5 to 10 minutes
allowing it to acclimate before calibrating.
If the probe has been inadvertently left in air and the reference electrode junction has dried out,
good function can usually be restored by soaking the probe in the pH 4/KCl solution described
above.