A peak flow meter is a handheld device that measures airflow rate and can help those with respiratory conditions like asthma monitor their condition.

Peak flow is measured with a specially designed meter. The U.S. National Library of Medicine says some asthmatics should keep a peak flow diary. Here are the agency's suggestions for what to record: ...

The peak flow meter measures the fastest speed at which you can blow air out of your lungs. During an asthma episode the windpipes begin to narrow slowly. This change can be measured with a peak flow ...

Those with asthma are advised to keep taking your preventer inhaler daily, carry your reliever inhaler, start a peak flow diary and use an asthma action plan, according to Asthma.org.