Feature: 1. Optical Glass Lens: The reflective lens is made of K9 optical glass material, which undergoes precise polishing and coating process to extend the service life of the surveying prism Specification: Item Type: Mini Survey Prism Material: K9 Optical Glass, ABS Constant: +17.5mm Effective Diameter: Approx. 25.4mm / 1in Application: Tunnel, underground, mine, highway, and other surveying Package List:
1 x Mini Prism |