Amazon.com: Microlife Digital Peak Flow Meter with FEV1 & Tracking Software | Reliable & Accurate Respiratory Spirometer for Kids & Adults | Perfect for Home Monitoring Asthma, COPD & Other Lung Conditions :
Peak Expiratory Flow - Haag Streit
Measuring instrument for volumetric respiratory flow, necessary tool for asthma patients. Peak flow meter Stock Photo - Alamy