I took several pictures here: http://imgur.com/a/iDIPl. It is used to listen through concrete for plumbing leaks. Any help identifying it or at least pointing me in the right direction to find a similar one would be greatly appreciated! Thanks!

A contact microphone receives its entire signal from being in contact with a particular surface and the resulting mechanical vibrations, not from airborne sound waves. Sometimes referred to as piezo or transducer microphones.