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 5990-00-133-7734
NSN 5990-01-546-1649
NSN 5910-01-237-3733
NSN 6145-00-683-5353
NSN 5945-01-469-7950
NSN 6610-01-451-8096
NSN 6240-00-793-7969
NSN 5925-00-932-0108
NSN 6320-01-536-3077
NSN 5999-01-514-2553
NSN 5985-01-042-4606
NSN 6135-01-390-7364