I'm selling an old EDC 521 DC Voltage / Current Calibrator. It's in good working condition as far as I can tell, though I haven't tested the IEEE-488 interface (and have no way of doing so).
I've had it for a bit over 4 years, most of which has been in storage. I don't know when it was last calibrated, but it is within tolerances according to my uncalibrated Keithley 2000, which itself was within tolerances of the five other 6.5 digit DMMs I had until recently.
It's in good physical condition, except for some scrapes and scuffs on the bottom panel and torn & missing red filter on the left side of the display (I think it was orignally installed incorrectly, with the "gel" side exposed). The filter looks like it would be pretty easy to replace, but I never got around to it.
It's up on eBay, the listing has more photos, including some example readings.
https://www.ebay.com/itm/114118371740
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