ผลิตภัณฑ์ของฉันต้องมีใบรับรอง UL หรือไม่
What is UL certification? UL was founded in 1894. In the initial stage, UL mainly relied on the funds provided by the fire insurance department to maintain its operations. It was not until 1916 that UL was completely independent. After nearly a hundred years of development, UL has become a world-renowned certification body with a…