The only thing a Peak flow metre measures is how quickly air is expelled from the lungs. Peak expiratory flow is what is meant by this. According to research, assessing daily home spirometry in people with idiopathic pulmonary fibrosis is very clinically useful and feasible for almost all of the patients. Spirometer plays a critical role in the initial screening and assessment of "severity and kind of respiratory disease" in the diagnosis of respiratory diseases.   The use of a Spirometer makes...