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 6240-01-408-1212
NSN 5945-01-167-8498
NSN 5985-00-159-7343
NSN 5996-01-655-8035
NSN 5935-01-372-1914
NSN 6645-00-151-5280
NSN 6150-01-291-5381
NSN 5935-01-176-6480
NSN 5965-01-399-8454
NSN 5930-01-545-2985
NSN 6135-00-170-8819
NSN 6610-00-526-4394