The old Sun CCT-10 coil tester was a very good unit but is still expensive to this day.
It does a condencer test and a coil test.
https://www.garagejournal.com/forum/...ad.php?t=32791
The ones made back in the 50s would even preheat the coils for a good test but they didn't test the condenser and they had no oscilloscope.