What is the glucose range that Lingo shows? Lingo displays a range of glucose values from 3.1-11.1 mmol/l. Related articles Is Lingo the same as Freestyle Libre? Can I use Lingo if I'm on insulin? Does Lingo measure Ketones? Why does my new biosensor give higher or lower glucose readings than my previous biosensor? I am based in the US, how do I contact Customer Support?