The manual for your scope can be found here in Adobe pdf format:
http://bama.edebris.com/manuals/conar/255/
Clifton
:::: I need manual and or schematic for conar model 255 scope :::: any information would be appreciated ::: :::I have a manual that covers the conar 255 oscilloscope.e-mail me if you want it e-mailed to you. : :Gary - Manual still available? Would love a copy. Thanks. :