Reticle 27mm Crosshair This plain Crosshair Reticle has a line width of .001”± .0001” and is perpendicular within .00004”/.001mm. It is useful as a Boresight, Centering and Alignment Reticle. It can also be used to gauge the straightness, edge acuity and perpendicularity of lines and features.The pattern is right reading looking through the glass so that the pattern can be in direct contact with the object to be measured. The Reticle Pattern is very durable, double layer, deposited evaporative Chrome/Chrome Oxide, for a reflectivity of less than 5% looking at the pattern.The Patterns on all Reticles manufactured by Max Levy are replicated from Precision Chrome on Glass Tooling under clean room conditions. Click here to download drawing 27mm Compatibility Chart Full Compatibility Chart