The Lingo biosensor is factory calibrated and manufactured with some sensor-to-sensor variation. If your biosensor seems to give higher or lower glucose readings than your last biosensor, please keep in mind that CGMs are highly complex systems, readings can vary because of temperature, body location, manufacturing variations, and other external factors. As a result, it is expected that there are variations between sensors. Absolute biosensor to biosensor differences are independent of the relative changes in glucose levels over time and of your ability to see patterns in your data.