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Compact Styling Easy to read zones Dishwasher safe and easy to clean and sanitize Rugged and durable Helps ensure adherence to the asthma management program Designed for use by patients having a peak flow between 50 and 800 liters per minute; updated 10/12/10). It measures (PEF) peak expiratory flow which is a vaulable indicator in function and changes in asthma conditions. Peak flows may NOT be used to completely evaluate lung function.

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