Feature: 1. COMPACT AND PORTABLE: This total station spherical prism head is small and compact, easy to carry, convenient to use, and seamless with the measuring instrument 2. LONG LASTING MATERIALS: The prism is made of K9 glass and aluminum alloy materials, clear, efficient, long lasting, and will hold up in the harshest conditions for years to come 3. APPLICABLE SCENARIO: Total station ball prism come with strong magnet, can be used for metal bridges, rails and other places that can be attracted by magnets 4. EASY TO FIX: The total station spherical prism head has a throughhole in its magnetic base, so that can also be fixed to concrete and wood walls 5. HD AND ACCURATE: Spherical magnetic bottom prism, bottom magnet, HD prism, bring high accuracy measurement, suitable for all kinds of total station ranging, suitable for various measuring occasion Specification: Item Type: Total Station Reflective Sphere Model: BP001A Material: Aluminum alloy and k9 glass Prism can be adjusted in a universal direction Prism Diameter: Approx. 17.8mm / 0.7in Ball Diameter: Approx. 30mm / 1.18in Magnetic Base Diameter: Approx. 35mm / 1.38in Use: Used for total station, high accuracy measurement, such as high speed rail, shipbuilding, railway, site measurement. Package List: 1 x Total Station Reflective Sphere 1 x Storage Bag