Condensation and mold – yuck – often form when certain rooms become too damp and humid. For just $34.50, the nearly invisible Leviton Humidity Sensor and Fan Control does what its name implies: a sensor detects excess humidity and automatically activates the already installed ventilation fan to help reduce condensation levels. You can set sensor sensitivity, humidity level and automatic timeouts to meet room-specific ventilation needs.

 

[Source:- Tomsguide]