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Measuring very low value resistors. 1mR at 1A gives a reasonably measurable 1mV voltage drop.'Resistors' doesn't just mean resistors btw, it could be wiring, PCB traces (and shorts) switch contacts, windings, etc.
to check current measurement device such as DMM is within spec (Transfer Standard)
yeah but building good reference need good T&M equipments in the first place, hobbiests can build whatever they like.
You don't need high end test equipment to build and calibrate a current source, just a decent multimeter with good accuracy in the mV range and a precision shunt. Your accuracy is only limited by the meter.