Vital capacity (VC) refers to the total amount of gas that can be exhaled at one time when you are trying to inhale. Adult men's vital capacity is about 3500-4000 milliliters, and women's is about 2500-3000 milliliters. The better the health, the greater the vital capacity. The spirometer is a portable, hand-held device to measure your ability to exhale air from the lungs and can provide accurate data to reflect tracheal ventilation. The importance of vital capacity: The vital capacity of the lungs is closely related to human breathing. Physiological studies show that the human body's organs, systems, tissues and organs Spirometry (low values compared to normal values), indicating that the body's oxygen uptake and exhaust, the oxygen supply inside the body is not sufficient, when the body needs a lot of oxygen consumption situation (such as long time learning, work, strenuous exercise ) there will be a serious lack of oxygen supply, resulting in negative reactions such as headache, dizziness, pressure on the chest, lethargy, inattention, memory loss, insomnia, this will not only affect learning and work, but will cause many irreparable losses. health. Method of use: 1. move the red moving buoy to the starting point. 2. use your mouth to hold the blue mouth, take a deep breath, hold your breath, blow out a breath and try to blow the buoy further. 3.observe the placement scale for floating buoys. The average adult male can reach 400L/min, females can reach 350L/min and athletes and vital capacity can reach 600-700L/min. (Routinely calculated in milliliters ml. This pulmonary activity meter is measured by ascending L. The conversion is as follows: if the scale you are measuring is 400L/min, the conversion to common units is 4000ml/min. How to use the peak flow meter? Type the red pointer to the starting point of the ruler, and fingers on the peak flow meter do not interfere with the activity of the pointer. Stand up and take a deep breath. The mouthpieces of the peak flow meter enter the mouth, lips tightly surrounded by mouthpieces, forced to a quick breath.< br/>Write down the value of the red pointer and hit the pointer to the starting point Repeat the above action three times in a row and take the best value, one should pay attention to is: with the greatest strength and the fastest speed to exhale ; the lips enclose the mouthpieces tightly, do not block the hole with the tongue, mouthpieces. If you want to repeat the test, please note that the red pointer should be turned to the lowest point on the scale before each test. The package include: 1pc spirometerchild