GSTC Lung Exerciser is a trustworthy respiratory therapy apparatus which improves the lungs’ capacity and enhances breathing ability. The three-ball spirometer system makes this tool effective in carrying out deep breath exercise which strengthens the breathing muscles and assists in developing proper lung expansion. This tool is most suitable for patients who have undergone surgery as well as those undergoing pulmonary therapy. For more information contact us: https://www.gstc.com/product/lung-exerciser/