spam webbing kit question

In today’s telegraph - sorry can’t link - there is an article on the American troop
withdrawals from Afghanistan & Iraq. There is an accompanying photo of a spam soldier
with a odd looking piece of kit on his webbing. It appears to be about 1ft long and 2”wide with , what looks to be a handle and some sort of dial/meter under it
and has the words “NEWIN” in prominent white lettering on the front. As I have been out for some years I was wondering what it could be? My only guess is some sort of
searching metal detector thingy as used at airports etc.

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