thats alot of reserved!
[PRELIMINARY]>snip<The x-Rite i1Pro 2 (you only need the basic version for projector/display calibration use)The i1pro 2 is a very good, semi-pro, near reference spectroradiometer. It is not to be confused with the x-Rite i1 Display Pro, also called i1d3, which is NOT compatible with the JVC Autocal. It’s average error shouldn’t be further away from reference than 1dE (max), which is very good for the price. That’s the meter I use to train my BasiCColor Discus when I use different calibration software, and the one I plan to use for color (gamut+white point) calibration with the Autocal.>snip< The older i1pro (preferably rev.B-D), that isn’t officially supported and has a smaller range (0.2-300nits). Still it can be used with the Autocal software, but I would only recommend it for a color calibration (gamut + white point), not for a gamma calibration. It also needs an initialization more often than the i1pro2, which makes it more annoying to use. See https://xritephoto.com/documents/literature/en/L7-518_i1PRO-i1PRO2_en.pdf for the differences between the two versions.
Have you got a source for the quoted accuracy for i1pro2? For what it is worth I don't think there is any particularly good information out there with respect to the accuracy of the i1pro2 for projection or displays - I've seen a couple of sets of data for single meters (including a comparison by Tom Huffman of a single meter against several display techs). X-rite only quote reflective (paper) reading accuracy in their certification, so even if you have it recertified it doesn't tell you anything about display measurements.Going way back, the only really good group-test I've seen of meters, looking at many samples of each, was this one from Dry Creek Photo which included the previous generation i1pro meter:https://www.drycreekphoto.com/Learn/Calibration/MonitorCalibrationHardware.htmlThey measured mean difference against a "true reference" spectro; a significant batch of i1pro units had a mean dE2000 of 4.3 for standard gamut CCFL LCD and 2.3 for wide gamut RGB LED backlight. Average dE2000 between units was 2.0 and max 3.5.I'd dearly love to see such a comparison of i1pro2 units; there are several changes which claim benefits (such as the wavelength calibration) but I've not really seen anything. Most of the reviews of these devices tend to be from folk just looking at the functionality.
Yes, I sent you that link to the drycreekphoto test when you were asking about the Discus I haven't seen any third party assessment of the i1pro2, I can only say that it's pretty close to reference. Whether it's 1dE or 3dE, I have no idea, but it's below the visible threshold for most of us, unless it's defective. I have no reasons to believe that the dE for the i1pro2 should be lower than for the i1pro, but as I haven't seen any trustworthy 3rd party review I put the manufacturer specs. [EDIT: I changed the 1dE in my post to 1-3dE as it's more likely to be closer to reality].My point is that unless you are a pro, it's hard to justify better than the i1pro2. And recertifying it is pointless unless it's defective, as they never adjust anything in a recertification. They measure and send you the measurements. If it's within specs, that's all they do. If it's out of specs, it's defective and you have to pay for repair. Needless to say that I don't recertify my i1pro2 anymore...I think the biggest point against the i1pro is the smaller range with a peak of 300nits, rather than the accuracy. Apart from that, they are both "good enough" to be used as a near-reference meter to calibrate a decent colorimeter. I don't use them for anything else than that, but I'll try a few things when I get the rs2000.