The oscilloscope photo below shows this changing ... One is with a 10MΩ FET analog meter for measuring the voltage across a smoke precipitator. The other is with the analog meter again but ...

They are all ways you can make oscilloscope probes that measure current. If you think of a scope as a voltage measurement device, you ought to watch the recent video from Keysight Technology (see ...

To determine peak voltage from an oscilloscope trace ... this is not the effective voltage of the trace. A more useful measure of a.c. voltage is the r.m.s. or 'root mean square' voltage.