FourRod System: This aluminum alloy bias test mirror replacement kit includes four 30 cm measuring rods. They are easy to assemble and disassemble, providing flexible, efficient setup for surveying tasks and helping field work proceed with less downtime. Mirror: The 25.4 mm diameter circular copperplated measuring mirror delivers stable, repeatable results with a 17.5 mm constant, aiding millimeterlevel accuracy for reliable land measurements and reduced measurement errors. Sturdy Construction: Made from robust aluminum alloy with 12 mm rod diameter, the total station measuring rod is designed to withstand varied weather conditions and daily field use for longlasting performance in demanding environments. Total Station Compatibility: An essential accessory for total station measurement, supporting accurate data collection and reliable surveying performance across compatible instruments. Versatile Applications: Well suited for tunnel construction, subway projects, mining operations, and highway inspections, enabling precise measurements across diverse surveying and engineering tasks. Use Scenarios: Tunnel construction and subway projects: use for precise alignment, staking, and crosssection surveys to maintain project tolerances. Mining operations and highway inspections: support accurate staking, bore surveys, and alignment checks in rugged environments. Routine field surveys: quick assembly and disassembly improve efficiency in variable weather and onsite conditions.