https://www.ktc.re.kr/web_eunited/default.asp?pagen=17

KTC, which stands for Korea Testing Certification, is a national-level certification body in South Korea. KTC tests a wide range of electronic products in its state-of-the-art facilities. Based in Gunpo-city, they have been in the testing and certification business since 1970. Electronic gaming machine testing is just one section of the wide variety of testing that KTC conducts.