SitePro 0/-30 mm Single Tilting Nitrogen-Filled Prism System – Orange The SitePro 0/-30 mm Single Tilting Nitrogen-Filled Prism System is a high-performance solution engineered for precise distance measurement and demanding surveying applications . Featuring a 62 mm precision ground glass prism with up to 2 arc-second accuracy , it delivers reliable, repeatable results in both control and layout work. The 0 / -30 mm offset constant and tilting prism assembly with front lever lock provide flexible, secure positioning in a wide range of field conditions. Built for durability, the system includes a nitrogen-sealed prism canister that prevents internal condensation and maintains optical clarity in changing environments. A dual-sided aluminum target enhances visibility, while the aircraft-grade aluminum holder and 5/8-11 adapter ensure compatibility with standard surveying equipment and long-term field reliability. Key Features: 62 mm precision ground prism with up to 2 arc-second accuracy 0 / -30 mm offset constant for flexible measurement setups Nitrogen-filled sealed canister to prevent condensation Single tilting assembly with front lever lock for secure positioning Dual-sided aluminum target for enhanced visibility Aircraft-grade aluminum holder with 5/8-11 adapter Ideal For: This prism system is ideal for high-precision surveying, control work, and construction layout where accuracy and environmental protection are critical . It is especially well-suited for use with total stations in outdoor conditions , including projects where temperature changes, moisture, or long-term deployment could impact standard prism performance.