I am aware of something like that in so far that I hear rumours of it, but don’t know anyone that has actually seen it.
Looked in yellow pages, but zip.
Have used a company with a name like Leakbusters.
They use
acoustics
infra-red (looking for heat)
Hydrogen in the water, which seeps through absolutely anything above.
They guarantee to find the leak. I think the price isn't exactly fixed, it depends what they need, They found "my" person's leak by listening with a whizzy doofer. It was a joint at base of a rad tail under a suspended floor.
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