Is there a device to let us know if we have a water leak in our house?

The Flood Alarm, $20, is an inexpensive early warning system that's dirt simple to use. Mount it near a washing machine, sump pump or water heater - anyplace you're water wary. Position the probe where a watery threat would collect. If the end of the probe gets wet, an alarm sounds with about the same intensity as a smoke alarm, warning you to do something about the impending flood.

The Floor Alarm is powered by a 9-volt battery (included). The flexible probe can be snaked into tight spots or bent around corners. An indicator light on the front flashes every 30 seconds to tell you the unit is working. It also has an audible alarm indicating a low battery.