Where can I find the Elfix polarity tester?

Trying to test polarity of the various gear in my setup. Having no success finding one of these. Any suggestions?
It used to be available at Audio Advisor, check with them, or buy the van den Hul version. Regards, Alan
Hi Foster, I think I got mine from Audio Advisor......many moons ago.
Thanks guys; Audioadvisor has not carried this for a long time; I have the Van Den Hul and am not impressed with it.
Does anyone care? I found one in my Dad's stuff, that I got when he passed away. Does anyone still want one?