I like one day back about the time you were bulding that (Well few years later, like 1970ish) My brother had done a major overhaul on a farm tractor on the farm We lived on,,, Would not start.. Well, I grabbed a meter and took a few measurements and decided the points were not making (They were breaking just fine but they were not makeing)
He ask me how much I paid for that meter (a low end multi-meter, As I recall it was less than 10 bucks)
He said "We have one back at school cost Fifteen hundred does the same job".
That is why I know how to read that scope of yours
Of course..... The multi-meter did not interpert it's readings like the big one at school (I had to do it using my brain).