Hi,
today I got the static master I ordered at Ebay one week ago. The device is unused but old, the ionisator should have been replaced in april 2010. I don't know how many halflifes have gone, but it was rather cheap (~ 13 US$).
I placed a small piece of the strip in my cloud chamber to compare with a smoke detector am241 source and a source with a tiny piece of radium dial paint save from a WW2 airplane clock.
http://www.rapp-instruments.de/temp/polonium.jpg
http://www.rapp-instruments.de/temp/americium.jpg
http://www.rapp-instruments.de/temp/radium.jpg
It looks like the activity of the static master has gone it is now even less than the 30 kBeq of the smoke detector. Still lower is the activity of the dial paint but it shows long range, high energy alphas, and from time to time a very long range tiny electron track
http://www.rapp-instruments.de/temp/electron.jpg
So older static masters maybe to weak for neutron experiments but nice for testing all kinds of radiation detectors
Thomas