3 Ball Respiratory Exerciser - Surginatalhttps://www.surginatal.com/critical-care/covid-treatment-icu-care/respiratory-exerciser/The Surginatal Lung Exerciser is a 3-ball Respiratory Exerciser it is also called 3 ball spirometer and respirometer which is used by adults and children to strengthen their respiratory muscles and increase lung volume It helps in improving the respiratory system. It