Christine,
The Huey and Huey Pro appear to be the same hardware items, but the software used for the Pro calibration routine does more. Having read the help file, which covers both standard and Pro, it would appear that the basic Huey software does not have the routine for the hardware brightness/contrast settings. The user defined whitepoint and gamma adjustments do not appear to be in the basic Huey software either. There is more advanced help available in the Pro too.
The process actually used to do the calibration may well be different for the Pro, more colour swatches, more variation in different grey scales, etc. Not having seen the basic Huey calibration I cannot say for certain.
Pantone offer a Pro upgrade to existing Huey owners, this is a software download only, so it would appear that the gadget itself is the same, what the software does with it could be quite different.
Duncan
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