I have just purchased a standard kit, which has 4 attenuators 1:20. There is a warning on each of them "max voltage 300V". One of main uses of these attenuators would be ignition primary, which can easily have spikes up to 400V. I am worried not to cook the attenuators measuring this ignition primary, and in case this may happen - cooking the scope input due to over-voltage (giving the direct 400 V spike to scope instead of 20 which the attenuator would produce). On the other hand, I've seen so much manuals from different sources, with people using these attenuators for ignition - without worrying to damage anything.
I would appreciate your comments on this case. Thank you !