The WaterWatcher by STAK Enterprises is an advanced electronic float switch designed to detect and prevent water leaks before they cause costly damage. Unlike traditional mechanical float switches, the WaterWatcher’s sensitive floor sensor can detect various liquids, including water, soap, soda, milk, and condensate from dehumidifiers.
Worked for me a few weeks ago when its alarm warned of leak and cut electric power to washer. However, as I am unable to shut off water source myself and live in a multi-story building, I opted for an automatic water shut-off system.