The AirLife brand Airx flow incentive spirometer is disposable and designed for exercising and measuring of volume flow. Preoperative and postoperative patients increase their lung volume by keeping the instruments inhalation-sensitive ball suspended with their inhalation. The flow passages vary in diameter, affecting the effort required to raise the ball. The ball stays suspended as long as the patient maintains this effort. The flow indicator dial can be adjusted to indicate flow rates in mL/second. Includes spirometer housing, detachable base plate, 12 segmented corrugated tubing with 22 mm OD and mouthpiece.