What’s the cheapest scientific instrument that can get an average amateur to the bleeding edge of discovery work? So not just scutwork that the pros with billion dollars instruments like CERN or Hubble indulgently farm out.
Long story! Short story is knockoffs flooded the market: https://amazon.com/s?k=underwater+drones…
They got better very fast, and much cheaper. But underwater drones are now more accessible than ever, which was the goal!