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E671 and SP25-M

Hello all

My 35 year old lady (Mitutoyo) broke down today.   It showed E671 error after A650 reboot.  I checked the internet someone suggested the SP25-M needs to be installed or replaced. So I took off it and put back, still had the same error. I opened the tools box found 2 used ones and both did not work. I wonder anything I could do to verify the error or check those SP25-Ms before we order new part ?

Thank you