Permanent Cu/CuSO4 reference electrode
 Characteristics
①Suit for soil cathodic protection
②The life-span is more than 20 years
③Perfect reliability
④Steady potential
 Application
①It can accurate monitoring the cathodic protection status and measure the sacrificial anode’s potential

②It acts as auto control stable signal source in impressed current cathodic protection system
③It can be planted in the bottom of tanks or under the roads
④It can be pre-buried during the engineering and be used at a long time