Up for auction is an Atlas Copco Elektronikon II the part number is 1900 0710 12. This unit ensures that pressure is kept within a very narrow pressure band and it optimizes the efficiency of the compressor to provide pressure stability. I do know these retail for a few thousand dollars. The goo above the screen has been cleaned off also.
Supply: 24Vac/16VA
Relay:250Vac
24Vac 50Hz/60Hz
2X10:16A max
2X11-12:10A max
This item ships Priority Mail (2-3Day)... I can ship faster if needed but it will be more expensive.