People with asthma have problems when their airways constrict and tighten, decreasing air flow through them. A peak flow meter is a device that measures how fast you can blow air out of your lungs after you take the deepest breath you can. This is called the Peak Expiratory Flow and is measured in Liters Per Minute (lpm). The TruZone peak flow meter measures peak flows from 60 lpm to 800 lpm. This measurement indicates the condition of your airways.
It is important to know your normal reading. If you use the TruZone PFM every day, you will know when an infection may be starting, even before you feel symptoms. Everyone will have their own predicted normal reading based on age, sex and height.