The specification and drawings present a new apparatus and method for providing a stereoscopic display in electronic devices with a diffractive exit pupil expander using sequentially switching between right and left images of one display. The disclosed device performs the full range of filling, removal of gasses and contaminants, and pressure testing, in a small unit that can sit on a workbench or the floor to perform the tasks. The described method and compositions have been shown to provide both pain relief and improved mobility in treatment of lateral epicondylitis. The enclosure provides a controlled environment for performing measurements for use in determining a physiological state of a person. The doped barrier layer can improve the carrier mobility of the electron holes and increase the light-emitting area and the internal quantum efficiency of the active layer. In one embodiment, the female coupler and the male coupler are secured together by a pressure activated locking assembly which prevents disengagement of the male and female coupling until the internal pressure in the coupling is reduced to a predetermined level.