Sam Nelson formulated the question :
I used to run about 3km of thick and thin Ethernet in ceiling voids, and
there was never a TDR on the market cheap enough for `them' to let me get
one.

--

I often see the instrument on the surplus market at giveaway prices.

--

Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.org