How to Calibrate MT-CO2-A37 Support February 10, 2022 10:03 Updated Follow It is recommended to calibrate the device before use. And repeat periodically with use. Related articles CO2 Meters for Indoor Ventilation Control Updating or Reinstalling TESTER7-IP-3HD Firmware Coverage or scope of CO2 meters Adding users and viewing records on EZStation access control system UPS Calculator to know the duration as a function of the load