Heh, I'm the same way with my Earthworks microphone. Almost every time I've gone through a security checkpoint, the person manning the Xray machine flags it, and the person doing the hand inspection digs it out and closely examines it. It is a pretty fragile microphone, not something you want to drop--I always take a deep breath when someone else is handling it! Maybe you should get one of those new recorders that use flash cards or microdrives, no moving parts to break!
After explaining that it is a specialized test microphone, they show it to the Xray person, and with a smile I'm off to the plane. I have not been hassled about my equipment so far, just that I am concerned about the recent news of increased scrutiny on electronic items that may have been modified. With my custom wiring inside, and considering that it is non functional on it's own (unlike a computer that you can turn on, or a CD player that can play a CD), I just don't know if this was stretching things a bit. Perhaps I should put a couple of LED's in there to show some action!