First I want to say Bravo to the authors, amazing project. I've just bought a couple of clones, TC1 specifically, modded with a 22uF low esr cap and swapped mcu with a 644pa. Flashed u4 alt firmware, compiled and flashed of course the 1.40m on it. Seems that works very well.
I've bought it mainly for selectioning jfets. It shows Idss, coherent with a manual measure, but it's the only measure it give me. An important measure for jfets is Vgs(off), there is a way to show this value?
Thanks