1GREAT REFLECTION: This survey prism is designed for excellent reflection, largely improving the measurement imaging and accuracy. 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 used for tunnels, roads, bridges, dams, buildings or some other fixed places or objects to measure distortion and displacement. 4LONG LASTING: The total station prism has been through good workmanship, which is sturdy and firm, not easily be damaged, ensuring long lasting use. 5EASY INSTALLATION: Comes with a compact size and a light weight as well, the prism reflector is very convenient to install within minutes.