The Spirometer is a hand-held device for testing pulmonary function, which can be used to detect the patient’s respiratory function status. The device adopts differential pressure acquisition principle to measure parameters related to FVC, SVC, MVV and MV. It displays measurement results and respiratory waveform by the TFT HD screen, with data upload function, convenient for CLOUD management. It is applicable for diagnosis and therapeutic evaluation of lung diseases (such as asthma, COPD, pulmonary fibrosis and cough, etc.), routine physical examination, etc. It can be used in many scenarios, such as respiratory medicine, thoracic, anesthesiology, surgery, prevention and control institutions of occupational disease, physical examination institutions, etc.