DirectionsAttach 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).
Legal DisclaimerActual product packaging and materials may contain more and different information than what is shown on our website. We recommend that you do not rely solely on the information presented and that you always read labels, warnings, and directions before using or consuming a product. Please
see our full disclaimer below.