The sea water kit is used in conjunction with an M. C. Miller Co., Inc. submersible adapter to measure the cathodic protection potentials. The sea water in which the electrode is immersed is the electrolyte. Varying salinity causes a change in potentials as indicated in the chart below.

The Land Kit is supplied with a standard filling solution (4.5 M KCl), which acts as the electrolyte. This is a known electrolyte which can be used where the salinity of the sea water is unknown, as in brackish, fresh water / sea inlets. This is ideally suited for areas where chlorides would contaminate the Standard copper sulfate electrode. These areas would include concrete bridge decks (de-icing salts), swamps and marsh lands.