Pressing and pressing the MAX/MIN key for 3 seconds will enter CO2 calibration mode, and when the calibration is complete, the instrument will automatically return to normal operation for approximately 5 minutes.<br>When the icon starts flashing slowly, it is preparing for calibration, when the icon starts flashing at accelerated, it indicates that the calibration is in progress, and at the end of the calibration, the icon automatically returns to normal operation after a slow flash.
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