.075" per revolution, 13.334 threads per inch (that's how many times you have to spin the thimble to traverse the 1 inch range of the mic), 3 times faster than a standard mic at traversing. Gives you a really nice feel when you gently come up to your part and the thimble just stops dead in its tracks as you feel the part square up to the anvils. A much more reassuring feel. It takes far more torque to over tighten your reading which greatly expands range of allowable torque error basically just great, that' s all I have to say. If you get the chance to play with one I highly recommend it.
The anvil mic is the slightly older 40tpi style with a metal thimble, I like the metal a little bit better and would probably go with that style on something like a blade mic, I don't know if a completely rigid thimble exists but that would be my first choice. The starrett is just well....
(re-uploaded because holy shit that quality)
