Did you intend this post for the non-U.S. area, or were you aiming for general for wider readership? Say the word and I'll transfer the thread if you wish.
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.