In a message dated 30/03/2008 09:38:37 GMT Standard Time, markpringnz@yahoo.com writes:
Any one got one?
What does it look like?
Can you still get one?
I built my own...
A bit like a big tuning fork about 2 feet long and slightly less than 3/8" in width. Originally aluminium, the substitute was made from wood. Whatever you use it must be non-magnetic.
I don't think they were ever commercially available...
Norm