A small, tubular item utilizing an eyepiece, cross hair reticle, and an objective lens, to align the optical axis to the mechanical axis of a telescopic instrument. It does not have the viewing power of a telescope. It may have two like items secured in a common holder for simultaneous checking of a dual optical system.
NSN 2925-00-936-4333
NSN 5999-00-936-9271
NSN 5925-01-376-7024
NSN 5930-00-128-1883
NSN 5999-01-210-3158
NSN 5945-00-468-6465
NSN 6110-01-166-3859
NSN 6620-01-445-0111
NSN 6135-01-628-2903
NSN 5895-01-533-4439
NSN 6150-01-619-6782
NSN 6320-01-569-2672