This is a terrible device
This is a terrible device. It’s very difficult to use. The breathing technique necessary makes it very difficult to get a measurement, I usually have to try at least 5x before it measures and if you fail the 6th measurement then you have to wait an hour. TBH if I have to wait an hour I’m not going to use it again that day. I hate that I purchased this. In 10 days I’ve only been able to get 3 reads.