Btw for info you can buy the cheap mechanic thing for a basic spirometry test.
I guess without a doctor advice you won’t know what to do with it.
Cheap device for peak flow:
Clement Clarke 3103387 Mini Wright Standard Peak Flow Meter, Standard Range
Clement Clarke 3103387 Mini Wright Standard Peak Flow Meter, Standard Range : Amazon.co.uk: Sports & Outdoors
I guess without a doctor advice you won’t know what to do with it.
Cheap device for peak flow:
Clement Clarke 3103387 Mini Wright Standard Peak Flow Meter, Standard Range
Clement Clarke 3103387 Mini Wright Standard Peak Flow Meter, Standard Range : Amazon.co.uk: Sports & Outdoors