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Peak flow meter, measuring instrument for asthma patients, on a diary with the measurements Stock Photo - Alamy
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Promising peak flow diary compliance with an electronic peak flow meter and linked smartphone app | npj Primary Care Respiratory Medicine
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Microlife Pf-100 Microlife Peak Flow & Asthma Meter - Expiratory Flow Pef and Fev1 Measurement : Amazon.co.uk: Health & Personal Care
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