Slotting, welding, sparks splashing... During an interview in Helingeer New Area, Inner Mongolia on the 4th, the reporter saw a busy scene at the construction site of the aerospace cross scale measurement benchmark large scientific device. Currently, the project is progressing smoothly and is expected to be completed and put into use in 2026. Cross scale measurement standards are the foundation for leading the exploration of "the origin of the universe, the origin of matter, and high-end manufacturing". As the core project of Inner Mongolia's technological breakthrough, the Aerospace Cross Scale Metrology Benchmark Large Scientific Device carries the core task of metrological traceability in the fields of aerospace, national defense security, intelligent equipment manufacturing, etc. After completion, it will achieve ultra precision length measurement from nanometer to kilometer level, and undertake the strategic mission of China's cross scale metrology benchmark system. This component will carry significant technological infrastructure in the future, and the error must be controlled within the range of 'milliarcseconds'. What we are doing is infrastructure work, which is equivalent to laying the foundation for this' universal ruler for measuring time and space'. ”Introduction by Cao Yu, a staff member of Inner Mongolia Helingeer New Area Industrial Development Co., Ltd. This soon to be born national treasure, based on the Inner Mongolia reconstruction and introduction of the grating research team from Xi'an Jiaotong University, has completed the leap from the laboratory to the production line, achieving a breakthrough in the domestic high-performance grating and ultra precision cross scale metrology technology system. We don't do 'isolated island' scientific research, we want to turn the 'grating' of the laboratory into an 'industrial chain' on the grassland, "said Liu Hongzhong, a professor at Xi'an Jiaotong University. The project aims to build a navigation and positioning measurement benchmark and equipment system that integrates heaven and earth, and unifies time and space. It focuses on the key technical challenges of cross scale measurement in space and space, creatively integrating domestic high-performance grating measurement systems and error separation technology. It can support "carving" at the nanometer level precision and calibrate satellite orbits at the kilometer level scale, achieving a measurement accuracy of "one thousandth of a hair". At the same time, the device will break through the core technology of position accuracy measurement and metrological calibration of aerospace inertial navigation devices in the field of aerospace technology, overcome the core technical difficulties of cross scale benchmark metrological devices in major scientific and technological infrastructure, and establish a value traceability technology system in line with China's scientific and industrial development system on the national metrology system. (New Society)