YSI focuses on analysis, testing, identification, testing services. The analysis fields include component analysis, formula analysis, failure analysis, structure analysis, methodology development and verification, raw material quality control/evaluation, consistency evaluation, characteristic analy

1. Check the packaging and interior 1. Cartons and paper boxes (or color boxes) are clean and tidy, no moisture, extrusion deformation, dirty, marked clearly; 2, foam packaging size is appropriate, clean, and no deformation, moisture, damage and other defects; 3. The production date of the carton