Abstract: Protective sleeve, into which a conventional fiberscope or videoscope is inserted, is mounted so as to extend into a high pressure or high/ultra-high vacuum chamber to permit insopections or monitoring therewithin. In a first embodiment the protective sleeve comprises first and second body portions, each comprised of bellows-like flexible stainless steel. The second section has a length substantially corresponding to the articulatable distal end of a fiberscope or videoscope to be articulatable therewith. In a second embodiment, the first body portion is rigid, and axially displaceable relative to a gimballed mounting assembly through which it passes into the chamber. In a third embodiment, the first body portion comprises a shape memory ally. In both the second and third embodiments the second body portion, as in the first embodiment, comprises flexible stainless steel so as to be articulatable upon the articulation of a probe disposed therein.