Precision Resistors
With the availability of affordable precision resistors it has become fairly easy to build a diy “resistance standard” that is more than good enough for (most) hobby use cases, e. g. checking DMMs and comparing them with each other. So a while ago I built a simple enclosure for such a precision resistor with 4-Wire (4W) measurement terminals. 2-Wire (2W) measurements are important to me as well, because most handheld DMM don’t feature a 4W measurement. That being said, both their resolution and accuracy are pretty limited, so that I wouldn’t consider the 2W measurement all that critical. ...