When I was an apprentice technician for Mercedes-Benz in 1980-82 we used a moto-meter on every tune-up service and stapled the little print-out to the repair order for the customer to see.
We were also taught to remove the ignition distributor and put it in the Sun machine, install the points, check the curve and vacuum advance on the machine before putting it back into the engine.
Being an apprentice for the old crusty German guys was hard...but they actually taught you how things worked.
Little tolerance for stupidity or laziness though.