Looking at two pictures, it looks to be a NANO with a TFT, maybe touch screen?
Interesting, being as I just received two NANOs, though planned to use one to make a clone of a raduino.
Maybe both, in the back of my mind.
For a dummy load, I havea commercial grade 100-110 watt dummy load that I got on Ebay some years back. It uses an RF resistor mounted to a large heat sink, well worth what I paid for it.
I do have to use a UHF to N adapter, as it has an N connector.
Lots better than the Cantenna was. Lighter, no worry about spilled oil of whatever type.
I used transformer oil in the one I built. MY brother may have used mineral oil in his, being as he was less likely to search for, and find a source for transformer oil. Mine did leak a teeny amount through the pressure vent, just enough to make an oil/dust mix, LOL.
Anyway, I'd kinda like to build this mini dummy load with meter for QRP testing.