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 6150-01-652-7704
NSN 6620-01-554-0030
NSN 5835-00-408-5499
NSN 5910-00-063-8306
NSN 6320-01-335-8336
NSN 5915-01-137-3709
NSN 6130-01-065-8749
NSN 6650-01-340-0070
NSN 6610-01-538-0016
NSN 6650-01-442-6871
NSN 6320-01-119-3935
NSN 6685-00-752-1868