[algore]

https://www.starrett.com/metrology/product-detail/T469HXSP

The Starrett 469, 469M Series Large, Super-Precision Micrometer Head

The micrometer head has a 4-1/16” (103mm) thimble diameter and is graduated to 0.001mm, or 0.002mm for direct reading.

only $1800

[Red Badger]

I used to use that very item! when I WAS IN metrology!..........