4 ). CO2 Calibration :
After being used for some time, the CO2 sensor may need to be recalibrated if
tolerance occurred.
Press Enter and UP or DOWN button to adjust the calibration level if you have
an accurate reference. Otherwise, the recommended level will be 400. Press
Start button to start with the CO2 calibration process.
NOTE : Do NOT exhale or breathe near the sensor while activating the
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