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 60/40, ensuring minimal distortion and precise measurement, the irregular aperture of 0.1‑0.3 enhances accuracy. 4. High Accuracy: This prism offers a angle range of 10‑15 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 Prism Material: Optical Glass Aperture: 0.2-1 Irregular Aperture: 0.1-0.3 Smoothness: 60/40 . Package List: 1 x Conical Prism