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 7035-01-570-2897
NSN 6620-01-553-1080
NSN 5835-01-150-6084
NSN 4140-01-202-7853
NSN 5905-00-618-4760
NSN 5945-01-057-2646
NSN 5835-00-356-3825
NSN 5965-01-374-1651
NSN 5895-01-315-2986
NSN 5985-01-631-6108
NSN 6110-00-105-0428
NSN 5925-01-110-1918