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My asthmatic friend said I was blowing wrong - you're not supposed to purse your lips like you're blowing out a candle, rather you're supposed 'hoh' at it like you're trying to steam a window
Which meter? The normal issue is this one, which you fellate rather than playing like a trumpet, although I think you'd probably get a lower number by doing it wrong. If you're doing it right, you should be able to do 3 consecutive readings in under a minute and have them all within ±10l.min-1. The software on the electronic one flags unrepeatable readings.
gbj_tester
hippy
Got hold of a meter. First couple of hits on the peak flow were ~500 but then I was blowing 7-800s. My asthmatic friend said I was blowing wrong - you're not supposed to purse your lips like you're blowing out a candle, rather you're supposed 'hoh' at it like you're trying to steam a window, but harder. Doing it his way I dropped back down to 400s, lower than him.