Which company should I go to for brightness testing? Baijian.com is a collectively owned research institute with CMA and other qualifications recognized by the national metrology certification. It integrates testing, inspection, analysis, testing, technical consulting and other services. It has also been rated as a national high-tech enterprise and can carry out testing projects such as brightness testing. Having the national high-tech enterprise certificate and CMA testing qualification certificate, with complete testing instruments, the testing report can be issued within 7-15 days Testing items: Brightness testing, etc Testing standards: GB/T 12599-2002 Technical specifications and test methods for tin electroplated coatings on metal coatings: GB/T 17461-1998 Tin lead alloy electroplated coatings on metal coatings: Testing cycle: Generally, it takes 7 to 15 working days