Home > Lung Disease > How To Use a Peak Flow Meter Get the Flash Player to see this player. Rate: (Click the stars to rate) Published on Dec 21, 2008 by SRubinstein, Views: 5837 How to use a peck flow meter: Dr Steve Rubinstein, an allergist, demonstrates how to use a peak flow meter. People with asthma should know what their best peak flow is when they feel well. Then when you are feeling short of breath, you can tell based on your peak flow, how much your asthma is contributing to the shortness of breath. Peak flow can also help to determine if a cough is due to asthma.