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 5950-01-256-1867
NSN 6135-01-252-0315
NSN 5999-01-010-3039
NSN 2925-01-136-1095
NSN 5910-00-238-0297
NSN 4140-00-690-5288
NSN 5930-01-388-2756
NSN 7035-01-344-0209
NSN 5925-00-831-8882
NSN 5905-01-409-2951
NSN 5920-00-883-0993
NSN 6130-01-315-7519