Feature 145 DEGREE REFLECTION: This survey prism is designed for single side 45 degree reflection, with an effective diameter of 25.4mm, and a constant of +2mm. 2OPTICAL GLASS: This prism uses optical glass, which enhances reflection ability, with full texture, clear and bright, making the measurement more accurate. 3WIDE APPLICATION: Total station prism can be installed in tunnels, roads, bridges, dams, buildings or some other fixed places or objects to measure distortion and displacement. 4STRONG COMPATIBILITY: This 45 degree prism is suitable for Leica and other different types of total stations, widely compatible. 5LONG LASTING: The total station prism is made of ABS material, which is sturdy and firm, not easily be damaged, ensuring long lasting use.Item Type: Survey PrismMaterial: Optical Glass, ABSConstant: +2mmEffective Diameter: Approx. 25.4mm/1inUse: Used for Leica total station engineering tunnel surveying .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Survey Prism