Thanks for the work! In case anyone needs this under Windows, see here.

[hello-world-dot-c]

This was a great initial effort. Since I needed it to work under Windows I ported it to use HID instead of raw USB under Python, made it a module and also made sure that it works under Windows and Linux and also supports the FNAC-28. This is a relatively new device and not quite as fancy but by far the cheapest of the bunch.

https://github.com/hello-world-dot-c/fnirsi-usb-power-meter

Cheers, and thanks again!

Chris