As with his Raman setup, there were some good questions raised in the comments about whether he really saw the effect in question or just got lucky with plausible-appearing artifacts. It's hard to assess validity from the presented results alone, which is unfortunately common in Ben's videos. In the Raman video, he didn't test anything but a single styrofoam cup, and in the mass-spec video he didn't do the obvious baseline run with a clean filament.
Ben's channel is one of those rare ones where the comments are worth reading. You can really see how easy it is for a scientist to inadvertently fool themselves and others. I often end up yelling at the screen, but it's still my favorite YouTube channel of all time.
I think Ben's misused over there at google. He should be designing the national high school science lab curriculum.
My money would be on mass spec, although it requires high voltage and vacuum. Back in my old university days Zbigniew Gasnaya made a home gamer mass spec that worked fine for what looked to be about 300$ in today's parts
3 high DC voltage plates, a harbor freight vacuum, an amp...