What should I store my pH electrode in?

Proper storage of your electrode is important to maintain hydrated pH glass.

Using a storage solution, such as the HI70300L storage solution helps to maintain the reference electrolyte concentration. This is important because the reference electrolyte generates a known mV potential, without this, the electrode will not work properly.

Storing a pH electrode in water affects the reference electrolyte concentration, and it also damages the pH glass.

Buffers can also affect the reference electrolyte concentration if you store your pH electrode in them.