Hi Dick,
Yep, same scales!? I cut one down to fit the Y axis on my mill.? I've read that the stainless-steel rules are a different kettle of fish -- some have resorted to using an abrasive cut-off wheel to cut them down to size.
My main issue with the 3 on my mill is their battery life.? I found that particular DRO version draws more current than more-recent designs, at least when the display is on.? I've got a solution for that but haven't completed it yet.
It's good to hear that your DROs are still working OK.
-Mark
