Earth ground meter Vs Multimeter

[Neitrino]

Dear forum please help me with the following understanding:

There is (are) such equipment Earth ground testers (https://www.fluke.com/en/products/electrical-testi...) - it is used to measure grounded electrical systems or to measure.
Such equipment is having multiple poles that are attached to rods fixed in the soil etc etc...

However such equipment is having also a kind of simplified measurement option - 2 pole resistance measurement.

So my question is: if with such equipment with 2 pole resistance measurement technique one measures resistance between two points ( for example railway-to-earth resistance) why i can not use ordinary multimeter to measure the same resistance ? Even if the anticipated / ohm range is within multimeter scale ?

Thank you very much for your kind help.

 

[Baluncore]

However such equipment is having also a kind of simplified measurement option - 2 pole resistance measurement.

So my question is: if with such equipment with 2 pole resistance measurement technique one measures resistance between two points ( for example railway-to-earth resistance) why i can not use ordinary multimeter to measure the same resistance ? Even if the anticipated / ohm range is within multimeter scale ?

The simplified measurement is 2 poles. But it takes 4 poles to measure it correctly.

The test leads of a multimeter have a similar resistance to the ground resistance being measured.