Feature:1. [High Precise Land Surveying] This mini prism is designed for use with total stations, utilizing a 17.5mm constant to reduce errors and ensure millimeter level accuracy in land measurement.2. [Precisely Ground Glass Components] The mini prism features precisely ground glass components that are meticulously crafted to ensure overall measurement accuracy, delivering reliable and consistent results in surveying applications.3. [Heavy Duty Housing] The housing of the mini prism is constructed from heavy duty polymer, capable of withstanding various weather conditions and daily wear and tear, ensuring long lasting performance in the field.4. [Versatile Applications] This mini prism is suitable for a wide range of applications, including tunneling, subways construction, mining, highway inspection, and more, making it a versatile tool for various surveying and engineering projects.5. [4 Prism Poles] The mini prism comes with four measuring poles, allowing for easy assembly and disassembly, providing convenience and flexibility.Specification:Item Type: Total Station Surveying Prism Material: K9 Optical Glass, ABSEffective Diameter: Approx. 25.4mm/1inConstant: +17.5mmApplication: Ideal for railways, tunnels, mines, and highways, suitable for measurement instruments.Use: Widely used in industries such as subways, railways, tunnels, dams, and steep slopes..Package List:1 x Total Station Mini Prism1 x Cover4 x Measuring Rods1 x Storage Bag