It's an RF field strength meter. I watched about a half minute of the video then... | Hacker News

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		throwaway81523 42 days ago \| parent \| context \| favorite \| on: Gadget Exposed a Spy Camera [video] It's an RF field strength meter. I watched about a half minute of the video then shut it off.

Brian_K_White 41 days ago [–]

They are also near-IR lights with special filter viewing glass that produces a visible reflection from the camera optics.

If the camera can see you, you can see the flashing even if it's a pinpoint hidden recessed in a shadow behind a crack.

The good ones anyway.

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