(Lurker emerging from the woodwork)
I recently picked one of these up as well, despite an utter lack of need for it.
I had walked past it a few times at my University Surplus store, and only upon finding out that it has an intrrmal 5 ½ digit DMM did I make the impulse decision to pick it up. Mine seems to work fine, passes the self test, only issue is that the buttons are a little too clicky.
Like a few others have posted before, when searching eBay for more optional modules I realized that most sellers pull out just the terminal blocks, leaving the actual module PCB 's in the machine, then list the connector as the whole deal.
Turns out I made the same mistake, as I discovered upon further inspection that mine included 3 (!) of the 20 ch. multiplexers. Picked up a few of the terminal blocks for cheap, but again I have zero use for equipment this big, or 60 channels of anything that need monitoring.
The DMM is pretty sweet though, and entering commands then hitting execute to watch the display whirl away is so extremely satisfying. Would love to get a gpib adapter to play around with computer controlling it.