Last bit of offtopic here from me.
1. The document already exists
Not always. Calibration certificate is somewhat more of a legal document, rather than technical. Yes, manufacturer usually have calibration results as part of their QA system when instrument is manufactured/verified. It may not be a report per ce though. Calibration certificate issued by lab have to be in line with release procedures and may be subject for audit, so for a fab it's not just a piece of paper with some numbers given by some fancy calibrator. If I connect DMM6500 to my calibrator, do bunch of tests, I still cannot provide legal calibration certificate, so me telling "this unit have 2 ppm error on 10V range" is just chit-chat and not a legal certification.
2. You have already paid to have this calibration done, since it is baked into the retail price of the instrument.
There are different levels of calibration too. Factory calibration may not include as much points as top tier 17025 service. It is not limited to T&M gear. Components have same process - you can buy opamp which will most likely be in spec, but it will not have calibration report with measurement results for your particular piece. Most parts sold usually are not even tested to all datasheet specs, but rather window pass/fail criteria. If you want, you can pay more, and get calibration report or test data from your specific opamp/batch. It will not be $3 anymore, but you can do it.
Different fabs have different capabilities/accreditations, etc. Lot of variables in play. Also instruments may be tested/adjusted at the time of manufacture, but if customer buys a unit with calibration data request, it could be recalibrated prior to shipping. In case of hwj-d, providing him calibration data from 2 years ago would be only historical value and would not mean that instrument now is still in spec (it's most likely is, but you never know until you do lot of calibrations to characterize it over time).
3. Printing out these already EXISTING pages (or better yet just having it available online) certainly isn't costing 4x DMM6500 per unit. No company is going to sale a product for long that cost them 4x more to produce than they can sale it for.
I've included 3458A calibration report that was included. There are no existing pages with data for it.
I perhaps confused a bit, didn't mean that calibrating DMM6500 is 4 times the cost, but calibrating voltage standard in Tek/Keithley lab against top tier NMI can cost like that.
NIST service listed for $2727 for voltage comparison against saturated cells. Canada's NRC bit less,
$1840. Great that RISE is much cheaper, so was Taiwan's CMS even against PJVS. Add calibrators, resistance standards, capacitance, etc then all man-hours to maintain gear in cal, and that will make additional time spend to cook more detailed reports cost more.
There is always more to the story, rather than evil corporations keeping customers in the dark , just because they are evil.
For clarity: I don't defend vendor on not including data for every single sold instrument, I'd be first to cheer if we always get data with every single piece of equipment we buy, no matter simple 4.5-digit handheld or 8.5-digit 20K$ DMM. Another more worrysome thing - calibration labs will not provide you method they used to calibrate your instrument. So even when you do get data in report, how can you know how to reproduce it on your side, if method/settings are not even known to you?