I attached a Libre senor today. I trialed these a few years ago and wasn't blown away with them. Since then, they have been updated.
For those who don't know, these sensors have a fine filament that sits just under the skin, attached with a single use applicator. These don't take their reading from blood, rather the fluid under the skin (interstitial fluid).
You then scan and activate the sensor in the Libre App on a smart phone, the sensor then takes an hour to calibrate before being able to scan readings.
The part I find challenging with these devices is keeping them attached. These sensors are $95 each and last 14 days, if they fall off they can not be re-attached. I have decided to give the patches a try Prydey recommended. But I have also come across a couple of other options to keep them secured. None of these attachment aids were available when I trialed Libre's initially. Keep in mind, I don't sit at a desk all day, so the risk of bumping the sensor off or having sweat degrade the adhesive is a real concern for me.
The strap/band type would be good to have when I'm out mowing ect.
I have found so far that these gen-2 Libre's seem to be more accurate between a physical blood test and a scan.
That's for the tips Prydey.