Tianjin Golden Circle Instrument and Meter is a high-tech enterprise specializing in the research and development of metrological measurement equipment. It boasts advanced proprietary core technology in the industry and has strong R&D capabilities in optics, machinery, electronics, and computer program software applications. The company dedicates itself to metrological measurement technology and innovative development, with a team composed of experienced R&D personnel with many years of metrological experience. The company's developed steel rule calibration device is mainly used for the value transmission work of ordinary steel rules.