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Reticle 27mm 360 Degree Protractor with Crosshair This reticle is used for accurate angle measurement and alignment functions. The 360 degree protractor has divisions every 1 degre e with numerical labels every 10 degrees. The protractor pattern is accurate to within 1 arc-second. A solid-line crosshair marks the middle of the reticle, providing for accurate alignment. The line widths are 0.001”± 0.0001”.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 Show more