Think you have a TH2830 available, this could be a good reference to use.
Yes, at work.
If you want to know "exactly", either the ST2830 has to go to me or my ET35 has to go to work, because of the same ambient temperature/humidity.
However, this should only be of an academic nature, although with 0.05% basic accuracy with an LCR measuring bridge, we are already close to the academic question.
For reference components consider quality leaded Polystyrene, Polypropylene, Mica Capacitors, with some C0G SMD types. For DC or very low frequency using the Kelvin Clips for leaded precision resistors should be acceptable, and you can also use your precision DMM to verify results.
That is clear, or I hope it is clear to everyone.
Inductors are another story tho, and we don't place much faith in any typical inductors we have where precision is considered. Precision reference inductors may be available tho, but likely expensive.
Inductors are the "bitches" among complex components.
If they have a core, things get quite adventurous.
The core causes them to saturate (well, you won't usually achieve this with an LCR bridge).
The core has its own inductance, Al, which plays a role.
A core has a large tolerance range, easily around 30%.
If Q is negligible, and this is the case with a pure measurement, the tolerance values can be considerably reduced by adjusting the air gap.
Nevertheless, I don't really "like" coil measurements.
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If you consider the actual LCR measurement taking place with an inductor, it's the same as for a capacitor. The DUT Complex Voltage and Current are measured, then the Complex Impedance is computed. The only difference is the Impedance Angle is + for Inductance and - for Capacitance, then the test frequency is taken into account to display the Inductance/Capacitance Value. So unless the LCR is misbehaving the impedance levels measured, computed and displayed should be similar in magnitude but opposite in phase for Inductors and Capacitors. Sometimes meters display negative Capacitance for Inductance and visa-versa as the component goes thru resonance, or the wrong parameter is selected.
If you have ever done arithmetic with complex values, you should be familiar with this.
In principle, we can cover the majority of inductance measurements with a measuring bridge such as the ST2830/TH2830.
The situation is different when calibrating power chokes, as the measuring voltages and currents of a standard measuring bridge are not even close to being sufficient.
Or to put it the other way round, you are scratching at the "beginning" of an inductance.
For such cases, there is then the voltage-time area measurement, with real voltages and currents.