Air quality monitor detects the concentration of CO2, incl. temperature and humidity display. The NDIR sensor delivers reliable measurements. - For indoor use - CO2 concentration indicated in ppm - Temperature indicated in degrees Celsius or Fahrenheit - Humidity indicated in percent - Stores min and max measurements Display: - Good (green field = good air quality) - Normal (yellow field = normal air quality) - Poor (red field = poor air quality) USB AC adapter NOT included