When I opened the box on this unit I know it was a really cheap item. We have gone through several peak flow meters and this is by far the worst.
It was covered by insurance, but it won't work properly the tab doesn't move accurately. My fear is that someone who is just learning about asthma will get a hold of this horrible item and they won't be able to accurately tell what is happening with their peak flow. I'm throwing it away and paying for a high quality one.Get more detail about Omron PF9940 PeakAir Peak Flow Meter.
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