SMS Electric Co.,Ltd.Zhengzhou (002857.SZ) engages in the research, design, production, and sale of electricity metering instruments, electricity transformers, and electricity load management acquisition terminals primarily in China. The company offers standard test devices for measuring errors and functional tests of smart energy meters; portable meter test systems; energy meter terminals; testing automation products including automated assembly line calibration systems and intelligent storage management equipment such as secondary meter warehouses and turnover cabinets; simulation equipment; power consumption information collection systems comprising main station management software, collection terminals, and three-phase multifunctional smart energy meters; transformers including voltage, current, combined, and others; and energy storage products for power supply, grid, and user sides. Founded in 1996 and headquartered in SMS Industrial Park, Zhengzhou, China, it exports to markets including Korea, Australia, Mongolia, Denmark, India, Pakistan, Vietnam, Bangladesh, and other international regions. Recent developments include Shanghai Changyun Enterprise Management Partnership agreeing to acquire a 10.72% stake from Jin, alongside a share buyback authorization in late 2023 and ongoing financial reporting with Q3 2025 earnings scheduled for October 2025.