How often should a spirometer in continual use undergo volumetric calibration?

Name: How often should a spirometer in continual use undergo volumetric calibration?
Brand: Quizplus
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Question

Quizplus · Accepted Answer

Volumetric calibration ensures the accuracy of spirometer readings, and should be performed at least once daily for spirometers in continual use. Choosing options A or B would be excessive and impractical, while choosing option D would not ensure the accuracy of the spirometer for daily use.

How Often Should a Spirometer in Continual Use Undergo Volumetric