Features SPECIFICATIONS: Double sides reflecting sheet prism, 45 degree angle design, with +2mm constant, and an effective diameter of 25.4mm. OPTICAL GLASS: This reflector prism uses excellent optical glass, which is clear and bright, ensuring accurate and reliable measurement. FOR TOTAL STATION: The 45 degree reflector prism is used for total station, suitable for engineering surveying in tunnels, subways, mines, etc. INSTALLATION SCENE: This prism can be installed in tunnels, roads, bridges, dams, and buildings, used for distortion and displacement measurement. ABS PLASTIC PLATE: The reflector prism adopts ABS plastic shell plate, which is wear resistant, scratch resistant, and stable in installation. Specification: Item Type: Reflector Prism Material: Optical Glass, ABS Constant: +2mm Effective Diameter: Approx. 25.4mm / 1in Application: Used for Leica total station engineering tunnel surveying Package List:1 x Reflector Prism Package List 1 x Reflector Prism