Look he

http://www.eham.net/reviews/detail/7607

Looks like a good device. *I believe I've seen at least one UK
manufacturer who also produces a similar product...

Bruce

Okay. thanks for your replay.
I never seen such a device for sale here in the UK. You remember wich
manufacturer it was?

I hope more people replay with there experience!

Does it realy make any difference?

Thanks,

Sop