Part of the problem is that meters made before 2013 were calibrated to Whole Blood which was the old standard. In 2013 they changed so that modern meters had to be calibrated to what is termed Plasma so that they correspond more closely to the laboratory blood tests that use venous samples rather than pin pricks.
https://www.mylife-diabetescare.com...lucose-measurement/whole-blood-vs-plasma.html
For a while Abbott continued to supply the NEO in the old whole blood and this was one reason why Abbott did not get selected to supply the NHS after 2015. My NEO was whole blood calibrated, and my GP made me change meter to one approved by our CCG.
Accucheck changed their strips instead of the meter, so maybe Abbott did a similar trick?