Finder-Level-Control-Monitoring-Relay-72-Series-Finder-72-01-8-240-0000-P-The-Finder-72-01-8-240-0000-Monitoring-Relay-is-from-the-72-Series-This-Level-Control-Relay-is-for-measuring-Conductive-Liquids-The-level-control-relay-works-by-measuring-the-resistance-through-the-liquid-between-the-common-B3-electrode-and-Min-and-Max-electrodes-B2-and-B1-If-the-tank-is-metallic-then-this-can-be-substituted-as-the-B3-electrode-P-P-The-240V-AC-1-CO-SPDT-10A-relay-has-a-Sensitivity-Rang