On Friday, 24 May 2019 13:23:15 UTC+1, Harry Bloomfield wrote:
I saw one of these cheap in a charity shop and wondered if they were
any good? They seem to clip to a pipe and connect to the wifi to report
the leakage, I guess listening to the water flow, but they claim to
detect dripping taps too, which seems a bit unlikely. Do the need some
sort of subscription to Hive, to be of any use?

This sort of device has been round for a while.
Some purport to work by detecting the high frequency whistle generated by water issuing from a small hole.

There is another one that purports to work by ignoring surges in water usage but picking up underlying constant flows. (Even if very small).

They are sold on the basis of detecting underground leaks.

Easier to read the water meter by night I think when usage should be zero in most situations.