“The Mini-Wright™” measures the maximim flow rate in a forced exhalation, known as P.E.F. After determining a patient’ best P.E.F. with a physician, the patient can self-test daily. Individually calibrated for use by both children and adults. The Mini-Wright models have built-in, one-way valves. The AFS Low-range Mini-Wright™ incorporated the Aerodynamic Flow System (AFS) to provide accuracy and consistency. This smaller, Mini-Wright™ is specifically designed for younder patients. Mini-Wright™ Digital\n This digital peak flow meter is a ergonomic compact design that makes the Mini-Wright™ Digital comfortable to hold and easy to store, while the one button operation makes it simple to use. The water tight seal makes the Mini-Wright™ Digital waterproof and easy to clean. Comes complete with meter,adapter, instructions and peak flow chart.