Does a strain gauge work in both push and pull? When I look at the photos that you sent, I can see how they would be used for a scale because you could put weight on them. But I need to "pull" on the thread. So if I tied the thread on one of these and pulled the thread, assuming that the gauge was secured in one spot. Would it read the "pulling" action? Would it read it as a negative number?
Also, when you say amplification, what do you mean?
-S