Compact air quality measuring device for evaluating the concentration of carbon dioxide (CO2), incl. temperature and ambient humidity display. The built-in high-quality NDIR sensor delivers especially reliable measurement values.CO2 air quality display with the following fields: GOOD (green field = good air quality), NORMAL (yellow field = normal air quality) and POOR (red field = poor air quality). Stores the minimum and maximum measured values of the CO2 concentration, temperature and ambient humidity.A excessively high carbon dioxide value can cause concentration problems, headache and fatigue: the air quality measuring device also issues a audible warning if values are too high and reminds you to ventilate the room. The rechargeable battery allows the device to be operated for up to 3.5 hours without a power supply.What’s in the Box1 “Safe” air quality measuring device1 micro-USB cable1 instruction manualSystem RequirementsFor charging or continuous operation, an external USB power supply unit is required. Not included in the extent of delivery.