Abstract: A fiber scope for biopsical use which is designed to be operable by a single operator, and which comprises a pair of forceps with a relatively short extension, an adaptor for selectively controlling a motion of the forceps tip ends, and a stopper adapted to selectively fix the longitudinal motion of the forceps controlling wire with respect to the fiber scope proper. The adaptor is disposed at or adjacent to the inlet portion of a forceps guide sleeve which surrounds and extends longitudinally toward the tip end and operating handle of the forceps. The combination of the adaptor and the stopper will effectively serve to provide a delicate and versatile adjustment in positioning of the forceps with an easy manipulation during a biopsical investigation and sampling procedure.