What is a CO2 meter with calibration function?
 Where should I place my CO2 meter?
 How to manage multiple CO2 meters centrally?
 What is a CO2 meter?
 What if my CO2 meter turns red and the values are above 1200ppm?
 What is the difference between a CO2 meter and a CO alarm?
 What is the difference between manual and automatic calibration?