Maretron High Water Bilge Detector • BHW100

High Water Bilge Detector by Maretron. The BHW100 sensor has a target molded into the plastic enclosure (opposite the side with the Maretron label). The target should be exposed so that when the water rises above the middle of the target, the BHW100 will indicate high water by illuminating the red LED and sending a signal to the Maretron Switch Indicator Module (SIM100).