How to test contact resistance?
Measurements require four wire resistance measurement techniques: two lines produce a known current, and the two line measures the pressure drop on the contact resistance,
Some high-end digital voltmeter has this function (but not current), such as Agilent34401A digital voltmeter.
Since the contact resistance is very small, an ordinary three meter is certainly not possible. The contact resistance is a nonlinear resistor and is related to the current through it. Therefore, it is very complicated to measure
