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I lived in Macau for 7 years (2009 to 2016) and traveled to Hong Kong frequently from the US. There were always temperature scanners at the airport along with cameras. Travelers had to remove hats when approaching them.

So they were always prepared since SARS

Those things are useless as far as I've read. Feeling of security but walk a bit faster/slower and the results change enough.

Mainland China has had those for as long as I can remember (going back at least as early as 2010).

I’ve seen those in other airports. Pretty sure Narita had them back in early 2019.