Examples from the Web for spirometer
Hence, the spirometer directly measures the respiratory capacity, and only indirectly the pulmonary capacity.Pedagogical Anthropology|Maria Montessori
It will be found by occasional trials upon the spirometer that the breathing capacity increases with these exercises.The Mechanism of the Human Voice|Emil Behnke
Secure a spirometer and increase the lung capacity until it registers about two hundred and fifty cubic inches.
Note: I would advise a spirometer for measuring the capacity of the lungs.
The spirometer, a useful but rather expensive little instrument, measures accurately lung capacity.The Boy's Voice|J. Spencer Curwen