Special Features:

Perform precise adjustments by eliminating any possible parallax error, specially designed tool ensures the eye is perpendicular to the crt plane when checking the vertical and horizontal linearity alignment by restricting the eye's field of view. Used during alignment and focusing of the video on the screen of the monitor crt

Properties:

A fixture designed to hold/position aircraft components to facilitate inspection, repair, testing and/or replacement of components. D0 not use if a more specific name applies. See fixture (1) (as modified).