used to show that you are giving more detailed and accurate information about sth you have just mentioned :
The shelf is about a metre long—well, 98cm, to be precise.
used to show that you are giving more detailed and accurate information about sth you have just mentioned :
The shelf is about a metre long—well, 98cm, to be precise.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005