Powerful ones have resolutions less than 0.1 nanometer

MICROSCOPES

["Think of the tools scientists use to see things too small for the naked eye; the most advanced types can reveal even individual atoms."]

This clue plays on the idea of "powerful" meaning high-magnification devices—specifically microscopes, which can resolve details smaller than 0.1 nanometers in advanced forms like electron microscopes. The word "resolutions" hints at their ability to distinguish fine details, not the kind of New Year’s promises. It’s a straightforward definition once you realize the scientific context, with no hidden wordplay or tricks.