You can't use 2 devices simultaneously with the libre 3 sensor. You can use either juggluco or the libre 3 reader. I don't think you can even use the Libre 3 app and the Libre 3 reader at the same time. This is a limitation of the bluetooth used in the Libre 3 sensor. - 2024-09-01T00:01:22.671Z reddit
The sensors themselves can actually run for 15 days. With Juggluco, you just scan the sensor again after the 14 days have expired, and it will run for an additional 24 hours. This is when I do my presoak as people call it. Juggluco also has the benefit of being able to monitor multiple sensors at once. So I just attach a new one then and activate it. I watch 2 sets of data for a while, then remove the old one during the extra 24-hour period. 2023-07-27T06:44:26.413Z reddit
FreeStyle-Libre-3-patch/Juggluco-solution/juggluco-direct-instructions/en/instructions.md at main · maheini/FreeStyle-Libre-3-p
Public repo for developing a Libre3 interface for Xdrip, AndroidAPS... - maheini/FreeStyle-Libre-3-patch
github.com