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Reticle 27mm Metric Radius Scale with Protractor This Metric Radius Scale and 180 Degree Protractor is ideal for making very accurate radial and angular measurements. The radial ar cs are accurate to ±.001mm and the angle markings are accurate to within ±1 arc second.Pattern: 10mm Radius Scale with .05mm increments and Numerical Markings every 1.0mm. The Protractor has 1 degree segments and Numerical Markings every 10 degrees.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 Show more