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Portable Spirometer Children Peak Speed Meter Expiratory Peak Flow Meter For Monitoring Lung Breathing Function DIY Supplies:Plumbing Measurement range:50-800 L/min BTPSMaterial:Recyclable ABS plasticRed Color:Children are red The importance of vital capacity： The vital capacity of the lung is closely related to the human respiration. Physiological studies show that the organs, systems, tissues, and organs of the human body Spirometry (low values compared with normal values), indicating that the body oxygen uptake and exhaust, the oxygen supply inside the body is not sufficient, once the body needs a lot of oxygen consumption situation (such as long time learning, work, strenuous exercise) there will be a serious shortage of oxygen supply, resulting in adverse reactions such as headache, dizziness, chest tightness, listlessness, inattention, memory loss, insomnia, this will not only affect the learning and work, and will cause many irreparable losses to health. Breathing methods to increase the vital capacity of the lungs： Physical exercise can significantly improve the vital capacity, for example can often do some chest, rallying and other calisthenics exercises, insist on endurance running swim and play football, basketball, running, like runners and swimmers of the vital capacity of up to 6000 ml or more. It is important to note that no matter the choice of the method, it must be constant and constant practice to be effective