Kelvin probe force microscope

A Kelvin Probe Force Microscope (KPFM) is a tool scientists use to study very small things, like cells and molecules. It's like a tiny microscope that uses electricity to measure how sticky something is. To do this, the KPFM uses two metal tips that are close together. A small voltage is sent between the two tips, and the force created by the electricity makes one of the tips stick to the surface of the thing being studied. By measuring how strong the force is, scientists can get an idea of how sticky the thing is.