From the 80's and still working. Sun 1115 I attach it to my 350 Chevy Hot Rod for my friends to see garage art at its finest, Set Parade patterns, stacked Raster patterns of the secondary displayed on the Oscilloscope, dwell, vacuum readings set timing this tool is cool but must go because I'm sizing down. See it work. I still have the operational manual and this is a steal at this price,
Want the ultimate mechanics garage art tool, this is it.