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Why 2 multimeters
I have a feeling that when I put my multimeter on the low ohms range and put it across live and earth
(1) the RCD will trip
(2) the meter will go bang
One to measure current and the other to measure voltage at the same moment.
Yes if you were daft enough to do that it would trip, but that is not what I am suggesting.
Remember a loop impedance tester is just measuring current and voltage to calculate the impedance. Well technically if you break it down further it is probably going to be measuring 2 voltages and then calculating everything else from there.