Always check for quality certifications like ISO 9001 and IPC. These certifications ensure the supplier meets global standards for quality and reliability. Verify the authenticity of certifications by checking unique IDs and requesting recent audit reports. This step helps you avoid suppliers with outdated or fake credentials. Evaluate the manufacturing capabilities of suppliers. Lo... https://sanshunsmart.com/china-pcba-manufacturer/key-factors-evaluate-pcba-china-supplier-high-reliability/