Smart Peak Flow Bluetooth Adaptor

handheld device thatmeasures how well air moves out of your lungs.
During an asthma episode, your airways often narrow. A peak flow meter can measure this narrowing hours, even days, before you have any asthma symptoms.
If you get a peak flow score that's lower than your best score, this may be a sign of an asthma attack.
No need to plug the Smart Peak Flow meter directly into your phone.