I found a hp3456a in working order.
I LOVE mine.
Not only is it gorgeous to look at but the math features are amazing; specifically the "(X-Z)/Y" and "100(X-Y)/Y" functions.
Although the meter does not offer a current post, you can first measure a small shunt (via 4-wire) then store that in register Y (STORE, 8 buttons). Attach probes across the shunt then enable "(X-Z)/Y" via MATH,7 buttons to show current directly!
Also, I'm currently exploring the "(X-Z)/Y" function to directly read ESR! By (a) setting my FG to produce 1Vpp +0.5Voffset 200KHz square wave, 50R output Z, (b) the cap under test across the FG output, (c) a 100n cap (A/C coupling) to the 3456A set to ~V, (d) Y register set to the magic constant 0.006400, (e) then enable "(X-Z)/Y" via MATH,7 buttons to read out ohms directly.
Need to sort 10K resistors? Just punch in 10000 STORE 8 to save 10000 in register Y. Enable "100(X-Y)/Y" via MATH,8 buttons, then proceed to measure your resistors. The display shows % error directly. Easy peasy!
Can't wait to buy a bunch of thermistors to play with the THMS*C function too.