Just google Fluke TL2X4W-PTII
These are special 4W probes that work only with certain Fluke DMM
I see them. (
https://www.fluke.com/en-us/product/accessories/test-leads/tl2x4w-ptii/ds)
Those ports must have dual contact in each port? (as just read in the reply behind this one).
Given there's still a small current path outside of the Vsense on DUT side, let's say just 0.75" between tip and junction point in probe case, 0.75" of std copper wire of 18awg (probe tip dia), is gonna be around 0.406m-ohm each, x2 for 0.812m-ohm, which is enough to make a meter that reads to nearest 1m-ohm display non-accurate reading (assume using a 0.5 rounding scheme).
The 4-wire (two jack) setup that has just two probe tips, needs to have the tips fat and very short so that the ohms there adds into any rounding the meter will use, of which all efforts simply bring you back towards the 4W 4-probe configuration. Eg; actual is 1.0034 ohm, ideal is meter shows 1.003. Add in just 0.1m-ohm from probe tips, meter reads 1.0035 and then rounds up for display of 1.004. Yikes, the probes (super low additional ohms) makes the meter tell you the measured is 0.6m-ohm more than actual, vs 1.003 which is 0.4m-ohm below actual, yet from just the display diffs you see it as a 1m-ohm diff ! This appears to be what the pics have shown?
So I guess, why use a 4W 2-probe if the goal of any 4W is to remove any probe ohms from the readings? With the 1m-ohm resolution meter, the diplayed diff from error is near 1m-ohm, whereas the 4W 4-probe the displayed diff is from device resolution rounding.