Introducing our Cheapest Medical 3 Balls Spirometer, designed to help you breathe better and improve your lung capacity. Our product comes with 3 different sized balls - 600ml, 900ml, and 1200ml - to offer varying levels of resistance suitable for both adults and children. It serves as an effective lung exerciser to enhance your respiratory function and is ideal for individuals with lung diseases such as COPD and asthma. As a factory, we guarantee the quality of our product and strive to provide affordable respiratory solutions for everyone. Order now and experience the benefits of our Cheapest Medical 3 Balls Spirometer!