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Title: seems to measure speed not volume
Review: This is my first experience with a peak flow meter so I can't compare it to anything else. My understanding is that it is a device to measure total lung capacity, but the simplistic design only seems to measure the max speed of air, not volume. Following the instructions exactly while feeling fine, my PEF value is well below what it should be, but if I just give a quick fast blow, it is well above. It seems to me that it could measure how powerful a sneeze you can produce, but not the volume of air your lungs can process at a given time. I called Microlife to be sure I was doing it correctly before returning it, and they confirmed my technique was correct.
