The radon sensor in the Wave Radon, Wave Plus, View Plus, View Radon, and Corentium Home can cover 1,000 ft²/ 100m² without obstructions or barriers (like walls or doors). 

If you want to measure several rooms at once, it is advisable to have one device per room, depending on the layout. However, all of our monitors are portable, so once you have finished measuring in one room, you can decide to change the location to another room - see guidelines here.
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We always suggest you monitor the rooms where you spend most of your time, and check out our guidelines here about the ideal environment for optimum functionality.