Netatmo Weather Station
Keep track of the conditions both inside and outdoors with the Netatmo Weather Station ($180). Designed exclusively for use with smartphones and tablets, this system includes sleek, separate cylindrical aluminum and white modules for outside and inside, which work together to measure the temperature, barometric pressure, humidity, and CO2 concentration, and communicate with a dedicated app over Wi-Fi. It's like having your own personal Weather Channel, only without the dorky hosts and elevator music.