"check your glucose anytime you want : With a one-second scan, the reader over the sensor shows the current glucose reading, the last 8 hours of data and a trend arrow indicating if glucose is going up, down or staying steady. The reader stores 90 days of glucose data : you can see a complete picture of your glucose levels over 3 months. Sence through Clothing : The FreeStyle Libre Reader can capture data from within 1cm to 4cm of the sensor, even through clothing. To get a 24-hour glycaemic picture : Users need to scan at least once every 8 hours. No fingerprick : Use the FreeStyle Libre system and measure glucose discretly. Don’t let routine fingerpricks interrupt your lifestyle. Measuring Range : The test strip port measures blood glucose levels and blood ketone levels. Measuring Range : 20-500"