The Gestra LRG 16-4 Conductivity Electrode 500MM is specifically designed for measuring and monitoring electrical conductivity in conductive fluids. When used with the Gestra LRS 1-.. conductivity switch or LRR 1-.. conductivity controller, it can also act as a conductivity limiter or continuous blowdown controller in steam boilers. Compatible equipment includes the Conductivity switch LRS 1-50 and the Conductivity controller LRR 1-50 and LRR 1-52.