តើវិញ្ញាបនប័ត្រ UL ជាអ្វី?
First of all, let me know what UL certification is? UL is short for Underwriters Laboratories. It is the most recognized independent third-party laboratory in North America. UL certification refers to the certification certificate issued by UL company when the product is tested according to relevant testing standards. If a product has been certified by…