Reading this I don't think I was really clear with this posting. Notice at the end of this web page link that the DRO is an open source project. That means if you want to be able to read different scales the code is there as an example.
I have had my DRO-350 and that it's worked so well that it has delayed my CNC conversion project.
John
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I have the DRO-350 and also a DRO-550 that I never did use.
John Dammeyer