The Libre2 with it's new constant scanning is very good, except the short range that you have to have, to get within, to obtain the readings. If my phone is more than about 15 feet away, even with nothing in the way, it loses contact and I have to do a scan for the readings to be displayed. I can accept that going upstairs leaving the phone downstairs will break contact, but not if I can see the phone and still be out of range.