This high-precision L-shaped prism is for use with total stations in construction and surveying tasks. Its 90-degree right-angle provides accurate and reliable measurements, making it suitable for monitoring subway tunnels. 's sturdy and compact construction ensures dependable performance in various challenging environments. Features -Color:Black -Material:Stainless steel,glass -Size:8.90X8.50X1.40cm/3.50X3.34X0.55in -High precision: the l shaped prism ensures accurate and reliable measurement results, making it ideal for precise tasks -Subway tunnel monitoring: specifically designed for subway tunnel measurement and monitoring, meeting the demands of special environments -Right angle : the right angle prism facilitates angle measurements, enhancing usability -Total station compatibility: compatible with total stations, this prism improves work efficiency and accuracy in various surveying tasks -Portable and convenient: its compact and portable makes it easy to carry and use, for on the go professionals Package list: 1 small prism for total station