Neptune Systems LD-3 Optical Multi-Surface Leak Sensor

Solid Surface Leak Detector Probe (3.5mm Type) for the Fluid Monitoring Module (FMM)This sensor plugs into your FMM and, using reflected infrared light, will signal your Apex when it changes state from being wet to dry or dry to wet. This sensor can be used for constructing your own ATO (auto-top-off), as a high-level warning sensor in your sump, water storage level sensor, and much more. Included are a fastening nut and silicone washer. These sensors are sold individually.