Features • High-Quality Optical Glass: Crafted with precision, this prism enhances measurement accuracy, ensuring reliable results for all your surveying needs • Clear Reflection Design: With a 17mm constant and 25.4mm effective diameter, this mini prism delivers sharp and distinct reflections for optimal visibility • ABS Plastic Housing: Built to withstand wear and tear, the sturdy casing ensures long-lasting performance in demanding environments • Versatile Compatibility: Ideal for use with Trimble and other measuring instruments, this prism is suitable for various applications, including tunnels and mines • Simple Installation Proc: The clear threading on the brass adapter allows for quick and easy attachment to any 5/8in x 11 threaded rod or tripod Features: 1、Using Good Glass: Having been through excellent workmanship, the optical glass comes with high accuracy to largely improve the measurement. 2、Clear Reflection: Designed to have ？17mm constant and 25.4mm effective diameter, the mini surveying prism ensures clear image in reflection. 3、Great Durability: The lens is fully covered by sturdy ABS plastic housing, which has great durability against wearing and long term use. 4、Wider in Utility: Suits for Trimble and other measuring instrument, the prism can be used on the testing of tunnels, subways, mines, etc. 5、Easy Installation: The clear thread inside the brass adapter blow enables the prism to easily connect to 5/8in x 11 threaded rod or tripod. Specification: Item Type: Total Station Prism Material: ABS Glass Diameter: Approx. 25.4mm / 1in Prism Constant: -17mm Application: For the testing of tunnels, subways, mines, highways, etc. Suitable for measuring instruments such as for Trimble. Usage: Widely used in various industries such as subways, railways, tunnels, dams, steep slopes, etc. Package List: 1 x Total Station Prism Package List 1 x Total Station Prism