VOLTS,
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The 4-wire ohmmeter principle goes back many, many years, but it's still a reliable method for measureing very low resistance values. You basically use two wires to pass a reasonable current through the equipment under test and use the second pair of leads to measure the voltage drop and thus calculate the resistance.

Of course, if you have a suitable source of current and voltmeter you can set-up your own ad hoc instrument in the same way.