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 6150-01-656-3790
NSN 5985-01-149-2469
NSN 6620-00-634-9455
NSN 5996-00-925-1953
NSN 6645-01-096-9719
NSN 5930-01-227-1726
NSN 5996-00-721-2194
NSN 6105-01-544-5601
NSN 7035-01-621-3682
NSN 5905-01-189-1223
NSN 6135-01-190-2628
NSN 5998-01-317-2361