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Resp O2 Cardboard Mouthpieces for Peak Flow Size:Adult Central plastic core design 431215 Central plastic core design acoustic integrity remains uncompromised for accurate diagnosis Affordable Dynarex Disposable Cardboard Peak Flow Mouthpieces are designed for use with the Dynarex Resp O2 Peak Flow Meter to measure Peak Expiratory Flow (PEF) in both adults and children
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