Reticle 35mm Protractor, 1Degree Increments This 360 Degree Protractor Reticle is suited to making high precision angular measurements. The protractor has divisions every degree with numerical labels every 10 degrees. The angle markings are accurate to within ±1 arc second.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 35mm Compatibility Chart Full Compatibility Chart