Adjustable micrometer

[mklotz]

That's a beauty Marv, reaching otherwise inaccessible places answers a lot of issues in machinery repair. As micrometers increase in range, the frames deepen logically, but some repair work throws a wrench into the works only specialty items remedy.
There is another benefit; can be zeroed at any position or reading for comparative measurements against a sample or gauge. The Uni-mikes and other interchangeable anvil mikes don't have anything like it. Even a hub mike depends on a rigid frame.

I never got around to doing it but it would be a doodle to make an attachable cylindrical anvil for it and use it to measure wall thickness on cylindrical surfaces, e.g., tubing, pipe...