I have recently bought a NanoVNA-F V2 Portable to replace my miniVNA - originally marketed by miniRadio Solutions (Mrs).
The latter was supported by Dietmar Krause DL2SBA for many years. However, he recently gave up his role of development and support for this range of VNAs via his website dl2sba.com. It is now no longer possible to download the software for the miniVNA from this site, although I still have the most recent upgrade on my PC. This VNA was a useful piece of equipment with a variety of different graphical outputs and was easy to use.
In the past, the following website has proved useful with the miniVNA in determining the characteristics of impedance of ferrite and iron-powder cores, filters and coils etc. I expect it could also be used with the NanoVNA, although I have not tried it out:
https://www.nonstopsystems.com/radio/frank_radio_coax-sw.htm
Whereas the miniVNA covered analysis from 0.1 to 180MHz, the NanoVNA-F V2, supplied by SYSJOINT Information Technology Co. Ltd. covers 50kHz to 3GHz.
There is a user group: NanoVNA V2 Forum and you can download the manual here: 
This is as much as I can say at the moment, until I have spent more time using it. Hopefully other people will come along and share their experiences.
Regards
Alex Henderson M0TOT
