Spirometer :- A spirometer is a device that obtains information about how much air one can breathe in and out, as well as how long a person's exhales last. The spirometry test requires someone to breathe into a tube through which a spirometer machine measures respiratory effort. It is also known as a Lung Exerciser or Respirometer. USE of Spirometer:- Spirometer use to diagnose diseases of the lung if you are experiencing symptoms of a problem, or your doctor feels you are at risk for developing lung disease. Spirometer/lung exerciser use for lung disease treatment. It is used for Diagnosis of lung diseases such as asthma, chronic obstructive pulmonary disease (COPD), pulmonary disease, cystic fibrosis etc. The lung exerciser, used For checking Lung function before planned operations. It is used to evaluate the efficacy of medicines by patients with pulmonary disorders. To detect the effect of environmental pollutants on the lungs.