Here is another smart tool that lets you detect water leaks before they become a costly problem in your connected home. The Wally Smart Sensor notifies you of water leaks through mobile notifications. It monitors indoor humidity levels and temperature.
The device connects to a Wally Hub to connect to your iOS or Android devices. It lets you know when temperatures outside are low enough to increase the risk of frozen pipes. Costs under $35 at this time.[where to get it]