Features 1、K9 GLASS: This total station mini prism adopts carefully cut and polished K9 optical glass, ensuring more accurate measurement. 2、ALUMINUM ALLOY SHELL: Made from aluminum alloy, this mini prism has great wear resistance and falling resistance, greatly improving service life. 3、PROTECTIVE COVER: This mini prism comes with a cover, protecting the glass from scratches or damage, ensuring long lasting stable performance. 4、18CM POLE: This mini prism has a pole with the diameter of 16mm and length of 18cm, convenient for installation and fixation. 5、MULTIPLE USES: This survey mini prism can be widely used in various industries such as subways, railways, tunnels, dams, steep slopes, etc. Specification Item Type: Mini Prism Material: K9 glass, aluminum alloy Glass Surface Diameter: Approx. 25.4mm/1in Pole Diameter: Approx. 16mm/0.6in Pole Length: Approx. 18cm/7.1in Application: Testing of tunnels, subways, mines, highways, etc. Use: Widely used in various industries such as subways, railways, tunnels, dams, steep slopes, etc. Package List 1 x Mini Prism 1 x Cover