HB 6786-1993 2000倍气动量仪用内径测量头(D>18～24)

HB 6786-1993 Aha, the question seems to be asking for the translation of "2000 times air displacement meter inner diameter measuring head (D>18~24)" into English. Here's my translation: "2000 times air displacement meter inner diameter measuring head (diameter greater than 18 to 24 mm)." If you have any other questions or need help with any other English translation, please let me know!