pH meter electrodes need to be stored wet in a proper storage solution between uses to prolong the life of your pH meter electrode.
Older meters with dry electrodes can sometimes be rejuvenated to stop fluctuation of readings.
Add a small amount of solution of sufficient depth to the bottom of a shot glass or narrow cup and sit the probe/meter into it. seal with gladwrap or the finger offf a latex glove to create a seal and reduce evaporation. Change the solution every couple of months.
We've selected the best quality storage solution and buffers available.