On 19/04/2020 10:27, Dave Plowman (News) wrote:
In article ,
Martin Brown wrote:
What's the difference between the usual DIY IR guns and the ones which
they are using (Asia) to check body temperature in the epidemic?

The main difference is that the ones intended for use on humans or
animals are calibrated for the emissivity of human skin which isn't all
that close to being a black body for thermal radiation.

Do they have settings for different skin colours? Like before and after a
holiday in the sun? ;-)

Brits who have turned that peeling lobster pink colour they seem to aim
for on holiday may well show up as feverish on a temperature test.

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Regards,
Martin Brown