RE: [AMRadio] D104 mic element testing

[esieb]

It's a piezo  element, so don't put any voltage on it, i.e. from a VOM.  
Best tested with a scope or amplifier.  I personally use a Rad Shack 
self-contained battery run amp to test audio devices.

Ed, VA3ES
OK, how do you test a D104 mic element to see if is bad?
Alan