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These all use the AD59xx for DFT and other functions which ought to be good.

I didn't read the reason why the tolerance specs demand such recalibration for each measurement vs stored short-open-load calibration constants.

Of course, with an appropriate test jig, automated recalibration can be done quickly.  I have done this before (with help) on eddy current probes in steel tubing with XY vector reference defects.