Feature: 1. ABS PROTECTION: ABS material wraps the lens, making the prism anti wear and anti drop, greatly improving the service life of the prism. 2. K9 GLASS MATERIAL: Optical glass accuracy testing, prism adopts premium K9 glass, carefully polished, more accurate measurement and more durable. 3. MAIN USE: This 360 degree prism is mainly used to test tunnels, subways, mines, highways, etc. And the prism is always work with measuring instruments such as for Trimble. 4. WIDE APPLICATION: Widely used in various industries such as railway, tunnel, dam, steep slope, etc. This total station prism has a wide range of use. 5. EASY CARRYING: This prism is small and compact in size, and comes with a storage bag, easy to carry around for convenient use. Specification: Item Type: 360° Prism Material: K9 Glass, ABS Constant: +23.1mm Effective Diameter: Approx. 25.4mm / 1in Scope of Application: Detection of tunnels, subways, mines, highways, etc. Suitable for measuring instruments such as for Trimble. Application: Widely used in various industries such as railway, tunnel, dam, steep slope, etc. . Package List: 1 x 360° Prism1 x Storage Bag