How is a Peak Flow Meter used?
Attach the appropriate size mouthpiece on the input side of the Peak Flow Meter. Slide the indicator to the bottom (zero) side of the scale. Take a deep breath, put your mouth tightly over the mouthpiece and blow out hard and fast as possible, a short sharp blast. You do not have to expel all of the air in your lungs. The final position of the indicator is your PEFR (peak expiratory flow rate).
