QRS sells a Volume Calibration Syringe designed to fit the QRS spirometers. Although QRS spirometers cannot be calibrated in the field, the syringe allows you to check your calibration. According to ATS Guidelines, the volume accuracy of the spirometer must be checked at least daily.
If calibration is off, please contact QRS for recalibration of your spirometer.
For more information about the spirometry accessories and their support of the American Thoracic Society Guidelines, download the Spirometry Consumables brochure.