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