Reference electrode its use: for 1, precise monitoring of cathodic protection status. Sacrificial anode protection for potential measurement. 2, in the impressed current cathodic protection system for automatic control of the stability of the signal source, for buried pipelines and cathodic protection of underground metal structures of the project.. 3, can be planted in the need to monitor the position and who can not enter. Such as: the end of the center of a large container; underground fuel tanks and chemical storage tanks can not be close between the position; city pipe network beneath the surface. Can during the pre-construction laid, long-term use. 4, pipeline cathodic protection remote signal source.