UL is safe inspection agency of the United States, full name is Under-writers Laboratories Lnc, be sure namely the abbreviate of laboratory company, people habit call his safe calibrating company.

• UL 是美国的安全检验机构,全称是 Under-writers Laboratories lnc,即保险实验室公司的缩写,人们习惯称其为安全检定公司。