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Measuring step height

I have a Visio 300
PC-DMIS 4.3
I set up 2 gage blocks side by side 1 .600" and 1 .550"
I measured a the top of the .600" block with an auto focus point max zoom
set the (Z) origin to that point
measured the same point 10 times and got a range of .00222"
did the same on the .550" block and got a range of .00247"
I don't understand I feel this should be more accurate than this.
Does anyone have any settings suggestions that I can try?
Thanks
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