The QRS 3L Spirometry Calibration Syringe allows you to check the volume accuracy of your QRS spirometer (including the Orbit) at least daily, as per ATS guidelines.

• Accessory designed to fit the Vectracor Orbit Portable Spirometer
• 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.