The VOLTCRAFT CO-100 Carbon dioxide detector 0 - 3000 ppm Datalogger function, Wall mount is a stationary CO2 meter for determination of the carbon dioxide concentration (CO2) in the ambience air with the precise and long-term stable NDIR measuring method (non-dispersive infrared absorption measurement). Bad air quality is usually the cause for illness or tiredness and decreases the concentration and efficiency. The CO-100 is used to monitor the carbon dioxide content in the room air so that the corresponding ventilation measures can be initiated early on. A carbon-dioxide alarm value can be set individually by the user. If this value is exceeded, it will trigger an acoustic alarm. Three LEDs indicate the current CO2 content at a single glance.This display can show not only the CO2 concentration but also the air temperature and humidity.A data logger records the measured CO2 concentration values for the last 24 hours (and the corresponding temperatures and humidity) at 30-minute intervals. Maximum and minimum values can also be displayed.