The proper way to do this is by using a real microohm meter...
How do they work ?
First of all : kelvin sensing. 2 wires deliver a reference current, 2 other wires sense the voltage. Simple enough principle.
The problem is that, with such small resistances, the current needs to be large to get a good reading ( if you don't want to sink waya in noise ..)
Large current means that you would heat up the device under test. This will falsify you reading... Most parts, especially wirewound resistors, drift largely under temperature.
So, how to solve this ?
The answer is a pulsed current source. They apply this test current for a few microseconds, sample the voltage and turn the current off. The conversion is done afterwards.
True microohmmeters use sense currents of up to half an ampere. In the advanced machines you can select the test current as well as the polarity of the test current and the sampling rate.