Abstract: An adjustable housing or chassis for electronic devices specifically intended for mounting in panels of unknown and variable thickness, for example, in the panels of aircraft. The chassis includes base and cover members that telescopingly mate to form a complete enclosure for electronic printed circuits therein. The chassis members include plural flanges and/or sidewalls to create a self-interlocking chassis in which the cover is restrained from lateral and vertical movement on the base. The cover is axially adjustable on the base to thereby expose more or less of the electronic controls as dictated by the thickness of aircraft panel.