1、Excellent K9 Glass Material: This total station prism utilizes polymer encapsulated high end glass components to ensure not only accurate positioning, but also high durability. 2、High Accuracy: This total station prism is a high accuracy land surveying device that reduces errors and ensures millimeter accuracy for total station land surveying. 3、Accurate Grinding: This total station prism is accurately ground to ensure that your measurements are completely accurate. 4、Wide Application: This total station small prism is widely used in subway, railroad, tunnel, dam, steep slope and many other industries. It is suitable for DB and for Trimble. 5、Compact Size: This total station small prism is compact in size, it doesn't take up much space when you use it, and it is easy to install. Item Type: Total Station Small Prism Model: MP108A Material: K9 Glass, Aluminum Alloy Glass Diameter: Approx. 38.1mm/1.5in Applicable Scope: Tunnel, Subway, Mine, Highway and Other Inspection. Use: Widely used in subway, railroad, tunnel, dam, steep slope and many other industries. 1 x Total Station Prism 1 x Lid 1 x Storage Bag