gtr777HCD-GTR777, GTR888: E2, E51, AR 4-265-401-0[] Soldering irons using a temperature regulator should be set to HCD-GTR777, GTR888: MX 4-265-401-2[] about 350 °C. Caution:SONY HCDGTR-888 HCDGTR888 HCDGTR333 HCDGTR555 HCDGTR777 HCDGTR 888 333 555 777 HCD GTR888 GTR333 GTR555 GTR777 HCD-GTR888 HCD-GTR333 HCD-GTR555 HCD-GTR777; If you have