Primary purpose of this article is to explain Benefits of Use Incentive Spirometer. Incentive spirometer is a medical testing equipment generally used to measure and analyze the functions of the lung. This plastic device helps to measure the amount of air a person can hold in his lungs. This device also measures how well a patient moves air in and out of his respiratory function. Incentive Spirometers are also needs to diagnose other lung diseases including asthma, chronic bronchitis and emphysema. The goals of incentive spirometer are: Detection of pulmonary disease, Assist breathing, Optimized lung inflation etc.