I design 'em and build 'em and they REALLY work! 
eBay Links:
https://www.ebay.com/itm/285825801852
https://www.ebay.com/itm/285823822244
https://www.ebay.com/itm/285807578003
https://www.ebay.com/itm/285823885283
Thanx for looking! 
Description states
"LT1236-10 Ultra-Low-Drift 5ppm 10V Reference."
"Final Trim to 10.0000 VDC @ 78F, 50% Humidity"
"NEW, Hand-Crafted in USA to Work PERFECTLY, No Returns."
That's 5ppm per what? Day, month, year, degree C, degree F, supply voltage, RH, shock (since the ICs are socketed)?
Picture below states "Designed to affordably verify the function of Digital Multimeters".
Does that mean it is suitable to verify the function of my Agilent 34410A, Keithley 2015 THD, Solartron 7081?
After reading a mind-sickening slew of your pretentious, bloviating, self-serving and worthlessly hyper-critical replies to almost every thread in the various eevblog forums, I am not surprised that you have, once again, consistent with the nature of your valueless contributions, managed to contextually twist and misconstrue the information contained in my eBay presentations.
I want to thank you for wasting your time to review my eBay ads and I would like to recommend that you NEVER buy anything that I make or offer for sale because, I know from other sellers' experiences in selling to arrogant, self-important, meaninglessly pretentious buyers, that a business-oriented transaction would quickly deteriorate into just one more opportunity for a super-critic like you to clog the supply chain with baseless criticism, irrelevant observations and product misuse, culminating in costly and unjustified returns, refunds and bad feedback. PLEASE DO NOT BUY ANYTHING, EVER, FROM ME!
Now, as you and a few of your fellow super critics must well know by now after reading my various threads and comments in this fantastically helpful eevblog forum, I am offering my devices to the sub-200-dollar DMM buyer (predominantly handhelds) and not to legitimately engaged, professionally employed, high-end DMM owners and users unless they want one out of curiosity, etc..
Please note that I said "legitimately engaged" as opposed to "couch-dwelling, socially-maladjusted, hyper-critical forum irritators and thread-disruptors" who claim that they may HAPPEN to own some high-end equipment and, therefore, are somehow entitled to shower their scorn and derision upon all who may have been so foolish to have bought a DMM that cost less than $1,000.00 to check their electrical outlets, etc. around the house.
Now, to your asinine questions/criticisms:
If you knew anything at all about selling these types of devices on eBay to somewhat unsophisticated buyers (which you obviously have no feel for), you would understand that choking an ad with globs of technical specifications would quickly cause buyers to skip to the next seller's ad. Achieving a balance of general, parametrically illustrative specifications along with typical and comprehensible application information is about the best a seller can do in the very limited space-time available to encourage a transaction.
Therefore, in my ads, I try to present a few technical specs as a reference base to validate the usability and quality of the device and also, present enough application information to help the potential buyer to recognize the intrinsic usefulness of the device and to stimulate the desire to buy one. Of course, this has worked for me and the buyers of my devices. If you doubt my claim, you are invited to check my feedback as SQWARREL at eBay.
I have stated many times in this forum and elsewhere, that I do not claim my devices are going to satisfy the perfectionist demands of what they call "volt-nuts" or of those who are silly enough to seek a $20 calibrator that could actually perform well-enough to calibrate a DMM6500 or 34465A, etc.
So, your persistently annoying, continuously harping on that vein of your misunderstanding of what my devices are to be used for clearly demonstrates your arrogant, self-righteous effort to discredit the purpose for which and the essence of need for such low-cost verification devices. Please, give it up and take your meds and spare me and others from your side-swiping commentary.
Of course, if you were to somehow become magically capable of re-framing your commentary in a more constructive manner rather than to present as the preposterous hypothecator that you are, your comments might possibly be welcomed and appreciated by participants like me. But, with your track record, I don't think that type of positive behavioral change will be forthcoming from you.
TO: coromonadalix
I totally agree with you. If I were to sell reference devices to super-sophisticated, high-end professionals, I would be spec-ing LM399's and LTZ1000's for $500-$1,000 instead of $20-$40 LT1236's. Thanks for your comments.
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