I see a bunch of these AD584 voltage reference modules on ebay for under $3
The pcb looks clean. I like it. Thing is I am guessing they don't measure them with their 6 digit calibrated meters there and record the values onto a label
But wow these are sweet. I could design and 3d print a case for it (and share the file on thingiverse.com for people to download and print). Trick is getting it measured. Maybe my local electronics shop would measure it for me .. friends with the owner.
I could use this pcb as part of a larger, affordable, reference unit. Throw in some resistors for resistance checking. Not smart enough yet to build a current reference. But if I got help with that I could make a case that houses all three and share the CAD file with everyone on Thingiverse. Could even print out a few cases for people if I got some help with the design.
[I suppose I should create a separate thread for this.. maybe I am getting too off topic here? Sorry OP.]