Definitely YMMV.
I was bringing a mitutoyo caliper to China on one of my trips and the TSA agent at EWR said I was not allowed to take it because of the sharp "blades". I explained to them what it was for and they had to get the supervisor. The supervisor immediately knew what it was and said it was ok. I'm pretty sure it would have had it taken away if not for that "knowledgeable" TSA supervisor.