... It seems too simple to work but the readings are remarkably consistent. On my "bad" days, the readings will be lower but will group together within a few points. On "good" days, the readings are higher but again in close agreement with one another, if several readings are taken close together. I have a lot of confidence in the device as a good, low cost home check for Peak air capacity of lungs. ...
Check Amazon Price and Read More Reviews on Omron PF9940 PeakAir Peak Flow Meter
