alt Hacker NewsLVDTs are fun! I bought one for a project a few years ago (since abandoned), and have been slowly designing my own readout electronics for them. Three revisions later, and the performance is very good - to the point that I've bought more increasingly precise measurement gear to benchmark how it's performing. Currently, I'm testing it against some good glass scale linear encoders, and a capacitive gauge with a single-digit nm noise floor.
So many don't buy an LVDT, I guess.
Interesting. What applications are you using it for? (If you are okay discussing it.) diy calipers? Active feedback to a more complex mechanical system? As part of an optical system? It would be interesting to hear how these are being used. Especially from someone experience using/building them.