First introduced in the 1970’s by Dr. B. M. Wright, the Mini Wright Peak Flow Meter has been the first choice of healthcare professionals worldwide for measuring peak expiratory flow. International, independent testing has proven that both the Mini-Wright and the Mini-Wright ATS are the most accurate peak flow meters available. The Mini-Wright Peak Flow Meter is still the first choice of healthcare professionals in the world who are wanting to measure PEF. All meters are individually calibrated by hand to ensure consistent accuracy and reproducibility.