1、Excellent Aluminum Alloy Material: This total station rotating optical prism is made of excellent aluminum alloy material wrapped around the lens, which is wear resistant and drop resistant. 2、Rotating Protective Cover: This total station rotating optical prism features a rotating protective cover that can be rotated to easily expose the pentagonal prism and allows front view viewing through the center lens. 3、Handle Design: This total station rotating optical prism features a handle design with a slot in the handle for mounting a plumb for Bob line center lens for forward looking observation. 4、Wide Application: This total station rotating light prism is widely used in subway, railroad, tunnel, dam, steep slope and many other industries. 5、Leather Sleeve: This total station rotating light prism comes with a leather sleeve that can be used to store the prism when not in use to prevent it from being scratched.