The Android NanoVNA app also works with my old 2.8 inch "not-H4" early clone that I bought in October, 2018 (if I remember correctly). That was about 6 months after NanoVNAs became available. It would now be called an 'H2', but back then it was 'the only'. I think I've read that Hugen also created that app.
There are now versions of the NanoVNA with a micro-SD card holder for storing measurement data, too. Search the group postings for more information, and for information about adding Bluetooth communication to the Nano. These features are developed by users, not manufacturers, although I think that Hugen has begun incorporating the memory card slot in some versions now being sold. Not the -F, though - that's from BH5NU, not from Hugen, and uses different hardware and different firmware. (I have a -F too. It's great!)
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Doug, K8RFT
