e g a plane mirror prism or other suitable light deflecting means deflector 38 establishes a reference plane p from which range finding measurements may be made with fiberscope 10 reference plane p extends through the point of incidence of optical axis 40 upon deflector 38 and perpendicularly across axis 42 of objective 30 the distance b between axes 40 and 42 being known and fixed lies in the established reference plane light deflector 38 is carried by gear segment 43 which is in mesh with worm gear 44 segment 43 is angularly adjustable i e titlable by rotation of gear 44 with flexible cable 46 and operating knob 48 it is contemplated that component 12 objectives 30 and 32 light deflector 38 segment 43 gear 44 and cable 46 be supported and contained as a unit preferably in a surrounding flexible sheath s as schematically illustrated with broken lines in fig1 as such the composite range finding fiberscope 10 may be distally entered into a confined space and operated as follows leg 14 having face 20 is first directed toward a point 50 to be measured and then adjusted laterally to bring an image of the point 50 into centered relationship with crosshairs 34 as viewed on face 24 of.