Test Protocol for Lung Volume
- Set the end of mouthpiece into nozzle.
- Confirm that indicator points at zero. If it does not, adjust it by moving the upper outer ring to the right or left.
- Inhale deeply, stretching the body upwards.
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- When the lungs are full, set the mouthpiece between lips. Breathe out strongly in one motion, without leaking, until all air has been expelled.
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- After breathing out, read the measurement on the indicator.
- Repeat 3 times. The maximum value of the 3 measurements is your lung capacity.

