TASC Systems Water leak detector uses sensing probes to detect water from 0 to 1/8 inch above the surface. All electronic circuitry is encapsulated in epoxy to protect from dirt, fungus and short-term immersion in water. Unit provides DPDT (2 form C) relay contact outputs rated at 1amp@28vdc Max. Unit does require external power. Additionally the unit is able to accept and monitor 1 or 2 lengths of water leak detection cable via locking plug-in connectors.