SENSING ELEMENT FOR USE WITH MEDIA-PRESERVING STORAGE AND CALIBRATION CHAMBER

A single-use sensor structure, comprising: a sensor housing (1502) including a storage compartment (300, 1540) configured to retain a storage medium (322, 1542) therein, the storage compartment (300, 1540) extending between a plug (1560) located at a proximal end of the storage compartment and a sealing element (3 10b, 1512) located at a distal end of the storage compartment (300, 1540); a movable component (1504) longitudinally translatable relative to the sensor housing, the movable component (1504) comprising: a sensing surface (1522); an inactive distal portion (214) distal the sensing surface (1522); and a proximal portion proximal the sensing surface (1522), wherein the movable component (1504) is reversibly movable between a first position in which the sensing surface (1522) is located within the storage compartment (300, 1540) and the proximal portion is at least partially proximal the plug (1560) and outside the storage compartment (300, 1540) and a second position in which the sensing surface (1522) is located distal the sealing element (310b, 1512) and exposed to the exterior of the sensor housing (1502) and the proximal portion is at least partially distal the plug (1560) and inside the storage compartment (300, 1540); and a bellows structure (1570) proximal the plug (1560) and defining a sterile and compressible area which retains at least a portion of the proximal portion of the movable component therein when the movable component (1504) is in the first position.