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How in the hhell do magnetic probes hold accuracy

I watch these probes being pulled from the tool rack all day and see reports asking for +-.001" profile....5 tenths on each side. I also know the machine is stated at like 6ish microns per meter or some nonsense like that. Anyway, I've done machining, manual/cnc, I've done grinding....how does this probe sitting on a rack, get automatically placed onto this probe mid-program within 5 microns or 2 tenths from the last time it was placed? That precision in my mind I have to be wringing gage blocks together to remove the air.
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