This is how you do advertising on HN...

The page is a very explicit plug (pun intended?) for their industrial CT products, and it was clearly done for marketing purposes, not because it reveals anything interesting. It is an apples-to-oranges comparison of several cables, basically showing that they're doing what they're supposed to and are constructed as expected. It was even submitted by an account that is clearly tied to the company.

I'm not upset with them - I think it's a better ad than most - but it's a pretty solid case study of how clever "covert" marketing is being done.