A storage solution prepared with reagent grade chemicals that can be used to ensure optimum performance of your pH and ORP electrodes.
It is necessary to store a pH electrode in a solution in order to keep the glass membrane of the pH electrode hydrated.
Ideally a storage solution should be used; never store an electrode in distilled or deionized water.
 
This storage solution is specifically formulated to minimize microbial growth and to prevent any effects of diffusion/osmotic from storing a probe in a solution with the highly concentrated inner reference electrolyte.
Storing your pH and/or ORP electrodes in a storage solution will also keep the junction clear. Maintaining the hydrated layer and clear junction will help to ensure a fast and reliable measurement. 
The HI70300L storage solution should also be used to rehydrate the electrode after a cleaning procedure by soaking for at least one hour before taking measurements.