The floor water sensor is a conductivity sensing device that can detect when water bridges the gap between the two stainless steel tabs on the sensor. Lay it on the floor in a mechanical room in commercial, residential, and rental applications to get early notification of a leaking hot water heater, leaking pipe, overflowing pit, or any other device which could leak and cause water damage. Typical applications include floors, under refrigerators, cabinets, drain pans, weep holes, and aquariums.