A peak flow meter is a device that measures how well your lungs expel air. The device is a valuable tool for people with a respiratory condition like asthma or COPD, because it helps track the ...

Dec. 8 -- (HealthDay News) -- Measuring peak flow is important for asthmatics, as it monitors how well you can blow air from your lungs and may even help predict a pending asthma attack. Peak flow is ...