STC Changzhou was established in 2015 through the acquisition of CETC (Changzhou Electronic Product Quality Supervision & Inspection Co., Ltd.) (from 2020: STC (Changzhou) Company Limited). As an accredited testing laboratory of China Metrology Accreditation (CMA) and China National Accreditation Service (CNAS), CZSTC is qualified to perform comprehensive testing on products including but not limited to electronic parts, socket plugs, buzzers, mobile phone batteries, lighting equipment, audio visual equipment, information technology equipment and household electrical appliances. Testing expertise of Microtek Changzhou Laboratories - a subsidiary company of CZSTC and a contract testing laboratory of China Quality Certification Centre (CQC) were also acquired allowing STC to offer printed circuit boards, copper-clad laminates and plastics testing services to meet the needs of high-technology, electrical and electronic industries in the Yangtze River Delta.