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Measurement Variation over time
I have been using the Touch DRO for about 2 years now and am generally very satisfied with the product and ease of operation.  I am using the prebuilt board with Absolute EZ View aluminum scales.  I set up the counts per inch off of 1-2-3 blocks which in turn is within .001 per inch of what my machine dials read.  Over time, I note that my calibration will change - sometimes as much as .003 per inch.  This change is not related to ambient temperature as I have testing in shop temps between 40 F and 70 F day to day with no change.  Any thoughts to the cause?  I'm using a standard wall wart for voltage input.  Could this be the source?


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