Is a high-quality pen plotter designed for precision plotting tasks. 

Being part of the 7550 PLUS model range, this plotter offers reliable performance and accuracy. 

With GPIB connectivity, it allows for seamless communication with other devices for streamlined printing processes. 

Video of the Plotter working (not this one)

https://youtu.be/Tr7Mbw9gLpk

Don't know if this item works hence why selling as spares and repairs