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 5910-01-403-2812
NSN 5999-00-409-6884
NSN 5965-01-147-5847
NSN 5835-00-034-4976
NSN 5999-01-134-9661
NSN 6620-01-352-5640
NSN 6645-01-424-4667
NSN 5895-00-670-1783
NSN 6130-00-627-4330
NSN 6240-01-108-6195
NSN 5895-00-938-8473
NSN 5998-01-013-6440