Freestyle Libre Sensor Type 1. The Freestyle Libre Sensor, from Abbott, is a 14-day sensor for use with the Freestyle Libre Reader and allows the blood glucose reading to be scanned in 1 second. The sensor pack and sensor applicator are packaged as a set and intended to be used together.. 1 x Sensor Applicator. 1 x Sensor Pack. Product Insert. A small, discreet sensor that is worn on the back of the upper arm and continuously measures the glucose concentration in the body's interstitial fluid day and night. The sensor updates the glucose result up to every minute and stores up to eight hours of glucose readings in 15 minute intervals. It can be worn for up to 14 days and is water-resistant so continues to work while you shower, swim or exercise.. The FreeStyle Libre system is a Flash Glucose Monitoring system. The FreeStyle Libre sensor is worn on the back of the upper arm and continuously measures the glucose concentration in the body's interstitial fluid throughout the day, without the need for finger prick.. Freestyle Libre App Countries. The Freestyle Libre App is only available to use in the following countries: Austria, Belgium, Finland, France, Germany, Ireland, Italy, Spain, Sweden, Netherlands & UK.. You need to live in one of these countries to be able to use this system.. You can download the Freestyle Libre App by clicking here.