[hornychz]

Let me put myself a bit in this debate. Somewhere here (about Werk_AG?) has already been said that measurement
in the mV area is quite challenging and the results in many cases are not relevant. Among other things, this is mainly
due to the electromagnetic field in which the measurement takes place - the proximity of the power supply, the RF transmitter,
the ground loop, etc. The 1 m of the measuring conductor can be induced to voltage up to tens of mV. We help with
a low impedance of the load, but it is necessary to think of this - therefore also the shortest conductors, twisted, shielded etc.
Simple verification - by measuring conductors we check the voltage on a resistor that is not connected anywhere - eg here
in the size of 3K3. Very often, we do not need to measure zero.