SAF Aranet4 Home: Wireless Indoor Air Quality Monitor for Home, Office or School [CO2, Temperature, Humidity and More…

Amazon.com Price: 249.00 (as of 10:01 EST- More info)

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The perfect companion for indoor environments, allowing you to monitor CO2 levels, temperature, relative humidity, and atmospheric pressure in real-time
Easy for anyone to use – the color coding and the optional buzzer warns you when the CO2 concentration gets too high