[Harp-L] Astatic crystal elements

[bad_hat@xxxxx]

I have a box of elements from the last batch Astatic made.  I think 
there are also some ceramics in there as well.  I do not play crystal 
microphones at all now.  I would like to sell the elements I have but 
realise that time, humidity and heat may have taken a toll on them.  I'm 
not sure about how to go about figuring out which ones are working, 
compromised or dead.  It looks like I have 7 pmc 151 elements.  I think 
I actually have some others stashed somewhere as well.  Advice on 
testing etc greatly appreciated.