Zinc based reference cell surface with +/- 30 mV measurement accuracy. Application in salt water or saline water conditions. More than 10 years nominal lifespan. Dimension: 200 mm length (housing and Zn rod) and 60/70 mm housing diameter. 1 m pre-fabricated cable, 16 mm2 tripple isolated with steel armouring. Weight: 1.3 kg.