For those who are amateur radio operators you might have a antenna analyzer. That can also be used to measure the impedance of ferrite cores. The RigExpert AA-3000 I use works up to 3GHz, does Smith charts and R X graphs. Can measure SWR, |Z|, R, X, C, L (series and parallel models), RL, Phase at a single frequency. At my work bench I am lucky enough to have a Keysight impedance analyzer that goes to 1GHz but in the field I just use my RigExpert antenna analyzer. Great for when I'm at a group event in the field and someone wants their ferrite cores tested that they use as chokes on their coax cable.
For those who are amateur radio operators you might have a antenna analyzer. That can also be used to measure the impedance of ferrite cores. The RigExpert AA-3000 I use works up to 3GHz, does Smith charts and R X graphs. Can measure SWR, |Z|, R, X, C, L (series and parallel models), RL, Phase at a single frequency. At my work bench I am lucky enough to have a Keysight impedance analyzer that goes to 1GHz but in the field I just use my RigExpert antenna analyzer. Great for when I'm at a group event in the field and someone wants their ferrite cores tested that they use as chokes on their coax cable.