Why not just say 0.2 millimeter?
Why not 200 micrometers?
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