The Netatmo measures temperature, humidity, barometric pressure, indoor CO2 concentration and it even has a sound meter. It gives you notifications in real time and creates graphs from data history. You can connect multiple devices to each station and connect each station to multiple devices. You also get a free account for life from Netatmo to store your data that your stations collect. It comes with two stations to use indoors and outdoors and they are fully weather proof. This best selling system works with both iOS an Android devices and has received 4/5 stars from Amazon shoppers.
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