Use of portable reference electrode: copper sulfate reference electrode for portable field use. Mainly used to determine the potential of natural potential and cathodic protection of underground metal pipes, measuring soil stray current can also be used to determine the potential of the cable metal sheath and concrete reinforcement. The electrodes in the soil than the sticky places, for impressed current cathodic protection system in the control potentiometer with a reference electrode. Can be used in all types of soil and fresh water.