How to measure coils without inductance measuring device?

Place the known and unknow inductors in series and apply a known AC voltage across the pair of them. Best to use an o-scope for this but it's not beyond impossible to use the multimeter on AC measurement.

The sum of the voltages across each inductor will add up to the voltage applied across them both. If the two inductors are equal then the voltage across either will be the same. The smaller inductance will have a lower AC voltage.

Use the voltage ratio to determine the ratio of the inductors. For instance a 2H coil in series with a 1H coil will have twice the voltage across it compared to the 1H coil.