spirometer
Noun
Meaning
An instrument for measuring the vital capacity of the lungs, or the volume of air which can be expelled from the chest after the deepest possible inspiration. Cf. Pneumatometer.
Source: Webster's dictionarySynonyms
anemometer
instrument
angle
balance
clock
cylinder
barometer
galvanometer
syringe
odometer
thermometer
chronometer
radiometer
absorbance
pluviometer
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Examples
I recommend taking 10 breaths using the incentive spirometer twice a day.
You can also exercise your lungs using an incentive spirometer.