1SPECIFICATIONS: Double sides reflecting sheet prism, 45 degree angle design, with +2mm constant, and an effective diameter of 24mm. 2OPTICAL GLASS: This reflector prism uses excellent optical glass, which is clear and bright, ensuring accurate and reliable measurement. 3FOR TOTAL STATION: The 45 degree reflector prism is used for total station, suitable for engineering surveying in tunnels, subways, mines, etc. 4INSTALLATION SCENE: This prism can be installed in tunnels, roads, bridges, dams, and buildings, used for distortion and displacement measurement. 5ABS PLASTIC PLATE: The reflector prism adopts ABS plastic shell plate, which is wear resistant, scratch resistant, and stable in installation.