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Peak Flow Meter Meter with targeted zones: Illustration of 8-year-old boy demonstrating proper use of peak flow meter equipped with color-coded target zones for normal and reduced PEFR. Meter with vertical graph: Illustration of 8-year-old boy demonstrating proper use of peak flow meter equipped with a vertical graph. LifeART Collection Images Copyright © 1989-2001 by Lippincott Williams & Wilkins, Baltimore, MD