CO2 Monitor uses an SD card to record levels for exporting to your favourite spreadsheet software. You can sample levels every 15 minutes for over 2 years with a single SD card. Supports USB cable. This air quality monitor uses an NDIR C02 sensor for accurate monitoring of the levels within an area. As well as a large clear LCD the unit displays a traffic light system indicating at a glance if the level is good, normal or poor. Ideal for a school classroom, offices, hospitals and the home this air pollution monitor has an audible alarm to alert you to falling levels. Ideal for when we are engrossed in what we are doing. Poor levels of air quality are linked to a lack of concentration as well as headaches. Carbon dioxide detector range is 0 to 5000ppm (parts per million) with an accuracy of (0~3000)ppm: ± 50ppm or ± 5% or (>3000)ppm: ± 7% of reading. As well as being a CO2 meter the unit displays air temperature and humidity levels for optimum indoor comfort. Unit can also be switched between human and plant C02 monitor optimum settings., Manufacturer: ACCUR8