The supplied 3 Ball Spirometer is designed to encourage the user to take deep breath. The spirometer provides patient feedback by showing how well the patient is expanding their lungs. This deep breathing encourages the clearance of phlegm from the lungs. As the people breathe in, the piston or ball inside the column moves up. The height of the piston or ball shows how much air people breathed in. The offered 3 Ball Spirometer is made available by us to be used effectively.