Shenzhen YES Testing Co.,LTD (YST for short) is a company specializing in electromagnetic compatibility (EMC), safety (SAFETY) and radio frequency (RED) testing, chemical testing of imported and exported electronic and electrical products. An independent third-party professional testing organization for ISO system certification, technical consulting, and certification. The company's product export agency international customs clearance projects include: EU CE certification, RoHS testing, Saudi SABER certification, US FCC, ETL ...