I’ve been lucky enough recently to score a Keithley 2304 power supply off ebay for a measly $75. For those unfamiliar, these are high speed battery simulator units capable of measuring very low currents and also behaving like a battery and sinking current.
After the usual dusting off and alcohol wipe, I found the unit to be in a good shape despite being made in mid 1990s. The screen on the other hand was a different story- 20 year old technology meant pretty lousy contrast and viewing angle.
After taking things apart and finding a standard character LCD display, all I had to do was find a mechanical match with the same pinout and 5V operation. An ERM1602SBS-3 from www.buydisplay.com fit the bill and was also blue- an added bonus. The swap went pretty well, but I found the default contrast voltage of the original divider was not a very good fit for the modern display. So in went a potentiometer I had handy. (I did remove original divider resistors R624/R625 first)
While inside I also added proper binding posts to the front of the unit. By default all connections happen through a terminal block on the back- good for rackmount use, bad for benchtop)
EEVblog thread on these units