Feature:1. Optical Glass Material: Made of optical glass, this prism offers excellent transparency and durability, providing clear and reliable measurement readings.2. Wide Aperture Range: With an aperture ranging from 0.2 to 1, this prism allows for versatile measurements, catering to various optical glass size and thickness.3. Finish and Aperture: The prism features a smoothness of 60 or 40, ensuring minimal distortion and precise measurement, the irregular aperture of 0.10.3 enhances accuracy.4. High Accuracy: This prism offers a angle range of 1015 seconds, allowing for precise measurement of different angles and configurations, for a wide range of applications.5. Fine Processing: The optical glass lens is carefully polished and has a fine coating on the appearance, which greatly prolongs the service life of the lens.Specification:Item Type: Conical PrismMaterial: Optical GlassAperture: 0.2-1Irregular Aperture: 0.1-0.3Smoothness: 60 or 40.Package List:1 x Conical Prism