On Tue, 4 Jun 2019 07:47:57 +0100, Andy Burns wrote:

Was hopeing technology would have moved on a bit...

It has with the fancy ones that work with a smartphone

I'd worry about how "gimmicky" they are when they show an image
representing their interpretation of what they've detected within the
wall ...

Quite, I wasn't overly impressed by the demo linked to earlier.
Plenty of false detections that where ignored by the demonstrators...


but they aren't cheap.

More profitable, rather than more better?

B-)

--
Cheers
Dave.