The Spirometer Calibration Syringe is a precision volume calibration device used to verify the accuracy and performance of spirometers and pulmonary function testing systems. Available in 2 L and 3 L configurations, it delivers a controlled and repeatable air volume to help healthcare professionals perform routine calibration and quality-control checks. It is suitable for hospitals, respiratory clinics, pulmonary laboratories, diagnostic centers, and other facilities requiring reliable spirometry measurements.