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FreeStyle Libre 2 sensor calibration

You can't calibrate with the reader or the official app.
If you want to calibrate you need to use a 3rd party app like DiaBox (Android only) or xDrip.
 
Whilst you cannot calibrate the numbers that appear on the LibreLink app (or Libre Reader), if you do a daily finger prick you can get a general feeling of how close the Interstital Fluid Reading calculation (done by Libre) is to a blood glucose reading.
For example, if you find finger pricks (taken when your levels are stable and between 4 and 9) are always around 1.5 units higher than Libre at that time, you know to add 1.5 to what you see on Libre.
 
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