(possibly stupid) LFO question

[Greg Montalbano]

I've been trying to recommision my old modular setup, & consequently been
working with a lot of different LFO designs.  One difficulty I keep running
up against is getting a reasonably precise measurement of the  outputs of
the various LFO waveforms -- my digital multimeters are WAY too slow, and
even my old analog meter has that "averaging" feature that keeps the needle
from responding quickly enough.
So -- my (possibly stupid) question is:  am i missing some obvious method
of taking reliable voltage readings of an LFO output?

Thanks.