Re: Replacement display technology.
I have been pondering this today. I would assert that there are no suitable OLED displays easily available. There are tiny ones but nothing with the sort of size needed to replace the existing display.
There also don't seem to be any TFT LCDs with the right sort of aspect ratio. By the time you get to something wide enough, they are way too tall for the case and also getting quite expensive.
It's my opinion that the best replacement is LED displays. But even this is hard and by no means perfect. The readout needs a small text field on the left (Auto, Rel, dB, Stor, Recl, Bat, etc), a 7-segment numeric field for the value, including a leading minus sign (seven displays), and a small text field on the right (multiplier, units, and maybe "AC"). I think that the text fields can be handled by 5x7 displays. Either two VQC10, two HDSP-2000, or eight TIL305 displays. Maybe even HDSP-2113.