FreeStyle Libre Sensor The FreeStyle Libre sensor is designed to be easy to apply, wear and use. Small and discreet*. Each sensor is designed for wear for up to 14 days. *Sensor dimensions 35 mm x 5 mm and weight 5 grams. Other products available: FreeStyle Libre Reader Flash Glucose Monitoring System FreeStyle Libre Sensor FreeStyle Optium Neo Blood Glucose and Ketone Monitoring System FreeStyle Freedom Lite Blood Glucose Monitoring System FreeStyle Lite Blood Glucose Monitoring System FreeStyle InsuLinx Blood Glucose Monitoring System