SIEM,Co founded by several industry experts, it is a scientific and technological company integrating the R & D, production and sales of gas analysis instruments, carbon and sulfur analysis instruments and standard samples for gas analysis. Its main products include high-frequency infrared carbon and sulfur analyzer, oxygen, nitrogen and hydrogen analyzer, oxygen determiner, nitrogen determiner, hydrogen determiner, oxygen and nitrogen standard samples in steel, oxygen, nitrogen and hydrogen standard samples in steel Carbon and sulfur standard samples in steel, and acting as an agent to import various brands of carbon and sulfur analyzer, oxygen, nitrogen and hydrogen analyzer, direct reading spectrometer and other laboratory equipment. The products are used in metallurgy, machinery, scientific research, quality supervision and other fields.