Sidestream CO2 modules and mainstream modules do not need any form of calibration during daily use, because we have done range calibration at the factory, and our design can ensure that the measurement accuracy meets the requirements within the life cycle. The continuous use life of the air pump of the sidestream CO2 module has two configurations of 500 hours and 20000 hours, which can be replaced according to the needs of users. If the user’s continuous use time is particularly long when purchasing our sidestream module, it is recommended to configure a 20000-hour life air pump at the factory.