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 6320-01-056-1164
NSN 5835-01-584-8538
NSN 6240-01-525-0965
NSN 6685-00-867-3192
NSN 5915-00-709-0068
NSN 6150-01-005-9482
NSN 5990-01-378-7349
NSN 6135-01-333-5814
NSN 5965-00-147-3070
NSN 6685-01-399-1701
NSN 7035-01-477-2818
NSN 2925-01-239-6044