Both the reader and the Sensor should be stored according to the directions in the User’s Guide and Sensor Insert.¹

Sensor Applicator and Sensor Pack storage temperature: 4 °C to 25 °C

Operating and storage relative humidity:  10-90%, non-condensing

Operating and storage altitude: -381 metres (-1,250 ft) to 3,048 metres (10,000 ft)

Reader storage temperature: -20 °C to 60 °C

Operating and storage relative humidity: 10-90%, non-condensing

Reference

1. FreeStyle Libre flash glucose monitoring system User's Manual.