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Three devices using "peak flow technique". Comparison of PEF measurements using "Peak Flow technique" on three devices; Wright Peak Flow meter (square symbols), Micro-Medical turbine spirometer (triangles) and Vitalograph Fleisch pneumotachograph spirometer (circles). The values shown are the best of two measurements with each device. Patients are arranged on the basis of increasing PEF measured using the Wright's meter with "PEF technique".
