I instantly thought of taser too (although maybe I have spent too much time in lockdown in Mexico!). But like Isaac, I knew this would not be aligned to your BPS. And I would also lean toward waterproof lighter BUT and then again, I am not your ideal client, so I don’t even know what a Plasma lighter is or does.
If you have a niche that requires advanced knowledge of particular interest, I recommend you also ent an image of it to a circle of friends that are more aligned to your BPS to get a more robust focused group.