How to read a Heathkit Ignition Analyzer oscilloscope screen

This is my 250th video. Thank you to everyone who has subscribed to my channel. If you have not subscribed, and enjoy my videos, please subscribe. This video is about the 1960 Heathkit Ignition Analyzer I picked up at and estate sale. It was clean and in good working condition when I bought it for $15. Since I really cleaned it up. It shines like brand new! In this video, I talk about how to read the screen of the scope. It turns out the upside down pattern on the primary selection, is because the Model IO-20 analyzer was set up for positive ground cars... no big deal, just ends up showing it's age. Thank you for viewing my videos.