Huh! Yes as you can see, Peter with two pieces of stainless steel metal rod balanced so they swivel if they want to, and the United Utilities man assured me that if there was flowing water then they would cross over. Any metal will do, he said, even copper, so magnetism cannot be at work surely. It only works on flowing water and later worked on the main supply to the farm. Of course I had to get some of the villagers to come and have a go and it worked with every one of them.