The Bladr wireless Thermometer/Hygrometer is a great wireless meter, that uses bluetooth to connect the main base unit to the external reading units.
The product comes with the base unit and one external unit which constantly maintains an upo to date reading of both humidity and Temperature.
The base unit displays the readings of both the base unit itself and the external unit all on on big LCD screen.
The base unit also has a comfort indicator on it based on the rooms humidity, and can even sense if a door has been opened and letting in different air temps and humidity into your environment.
Super accurate, easy to use and read, and you can have up to 3 external reading units connected to the base unit, thats measuring 4 rooms in one cheap device!!