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Peak flow measures the volume and effectiveness of someone's breathing.  The meter has a mouthpiece, scale and two different types of the mouthpiece, sterile and cardboard types.  The cardboard is the most popular.  Ensure the patients found and teeth need to be clear of the mouthpiece. Tests are repeated three times and we take the highest figure.  By taking an initial reading then delivering treatment, a second reading will show the treatment is working.