Grizzly Mill DRO

FWIW I don't see a need for a scale on the knee (Z)... I have scales on X & Y and a Mitutoyo Quill Scale... I use the knee vernier dial for big height adjustments & zero the quill scale based on the location of the work... Been doing it that for years & it works great...

I have Newall on my mill & DRO Pros on my big lathe.... Both are high quality units... I actually prefer the DRO Pro unit....

Electronica Mill Kits:

Quill scale

Mitutoyo 053906B Digimatic Quill Kit, Vertical Knee | eBay