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Peak Flow Meter – Clement Clarke Mini Wright Standard Range . Peak flow meters allow patients to monitor their asthma; Peak Expiratory Flow (PEF) is a measurement of how fast a patient can blow out. When a patient is well their PEF is higher, when the airways are narrow (as in asthma) PEF is lower. Scale ranges from 60-800 l/min. Scale available in three colours for easy readings. Hand calibrated for absolute accuracy. Easy to clean, lightweight and portable. Suitable for both home and clinic use, also suitable for most adults and children. Supplied complete with instructions for use, patient self-monitoring chart and mouthpiece.