3300 volts is pretty but with a good hand held fancy named DVM I have measured up to 6600 volts. My only disclaimer is don't get killed trying what you don't understand.
How do I do it?
I prefer to make my own matched to the meter in my hand.
And I never really hold the meter in my hand when making a measurement.
I have done it on 2KA systems in the good old days.