HI70300L is 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.
HI7082 is a pH and ORP electrode fill solution that contains 3.5M KCl, which is specifically produced for double junction electrodes. The electrolyte level in refillable electrodes should be checked before performing any measurements.