[TowerTalk] Measuring the resistance of ferrite

[Bob Good]

Other than using the sales / technical literature,  how can I measure the resistance of ferritecore or beads to ensure that I have the recommended 5000 ohms resistance?  I gather that the resistance is frequency dependent and rises as frequency increases.  Also I gather that the best overall mix for HF is #73.  I assume this designation is universally recognized regardless of the supplier?  Can you help shed some light for this Old old timer?  Thanks,  Regards,  Bob K4BG (QRZ Info current)