The portable pulmonary function measurement instrument

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)
Measurement of breathing time:
VC time 50 seconds
FVC measuring time 25 seconds
MVV time 12 seconds