Can I still use a biosensor after it expires? October 07, 2024 10:44 Updated No - Expired biosensors may not give accurate readings. Please apply a new biosensor. Related articles What Bluetooth radio frequency does my biosensor use? Does Lingo measure Ketones? What’s included with my Lingo subscription? Can I use creams or oils during biosensor wear? I see the following message when using the Lingo app: Replace Biosensor