*the portable pulmonary function measurement instrument can be used to measure: - vital capacity (vc), - forced vital capacity (fvc), maximum ventilator volume (mvv). Measurement algorithm refers to the its, ers standards of the american thoracic society (ats) *adopting pressure-flow sensor, sensitive, precise, easy to launder, clean and durable *all parameters can be displayed on large screen(320 x 240), *built-in memory can store maximum 300 cases of patient measurement results *the instrument can calibrate automatically, all english operation, more convenient to operate *110mm thermal printer built-in, can print out a clear clinical report, predicted value, Measured value *measurement of breathing time: - vc time 50 seconds, - fvc measuring time 25 seconds, - mvv time 12 seconds, in favor of the coordination between patients and the device *compact and flexible