The CO 210 in addition to the control of the indoor air quality and the recording and evaluation of the measurement data. A too high value has a negative effect on health, the concentration and on the well-being. The CO2 value should be monitored in all rooms, in which many people over a longer period of time. In the display, the measured value of CO2, temperature, humidity and the time and date can be read at the same time. For a simple assessment of the CO2 value is also an index symbol is displayed: Good (0 - 800 ppm), normal (800 - 1200 ppm), poor (1200 ppm). The Adjustable Alarm value is exceeded, an alarm sounds.This text is machine translated.