Fluke 8800A 5.5 digit DMM, ca late 1970's/early 80's.
Super basic as far as DMMs go, this doesn't even have a NULL or REL button. Certainly no math, dB display, min/max, logging, etc. Just DCV, ACV (average responding), and Ohms. It is auto-ranging which is great. It uses a monolithic dual slope converter IC, likely Fluke proprietary, identified in the service manual only as "Part of final assembly". Gee, thanks. I opened it up to check on the two AA batteries that are used to power the current source on the ohms board, and was pleasantly surprised to find none. This one is apparently a later serial number that uses the same ohms board as the 8810A which has an isolated converter rather than batteries. Nice.
DC is spot on all ranges (photo shows 20 V range agreeing rather nicely with a Keithley 2001 7.5 digit meter). AC is accurate and very flat up to a couple hundred kHz. Too bad it's not true RMS (8810A is). Ohms looks accurate too. As you can see I don't need another bench meter (two Keithley 199 and three 2001 visible in the pic, one more 2001 out of frame), but I literally rescued this from the scrap pile at a local electronics recycler. They were purging stuff that had sat around unsold for too long. Paid... don't be mad. $5. Canadian. That's literally its value as e-waste destined for the crusher.