What is the glucose range that Lingo shows? Lingo displays a range of glucose values from 55 to 200 mg/dL (3.1-11.1 mmol/l). Related articles Does Lingo measure Ketones? Why does my new biosensor give higher or lower glucose readings than my previous biosensor? Can I use Lingo if I'm on Insulin? Do you really need a CGM to tell you what foods will cause glucose spikes? Can I use Lingo if I have problematic hypoglycemia?