Feature:1. REPLACEMENT PART: This replacement prism is used to replace the original observation prism of the total station, professional and standard, easy to install.2. OPTICAL GLASS: The mini prism replacement adopts optical glass, enhanced reflection ability, clear and bright, making the measurement more accurate.3. LAND SURVEYING: This prism replacement can be used together with a total station for land surveying and has a wide range of applications.4. PROTECTIVE COVER: The prism is equipped with an ABS protective shell, ensuring that the glass prism part is not worn and extending its lifespan.5. WIDE APPLICATION: This mini prism is suitable for subways, railways, tunnels, dams, steep slopes, and more places.Specification:Item Type: Mini PrismMaterial: Optical glass, ABSModel: AY01Glass Surface Diameter: Approx. 25.4mm/1inApplication: 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 Prism1 x Cover