Take a look inside a lab! Today, we’re offering a sneak peek of some new work being done in the room where the NIST-4 Kibble Balance is located. This mechanical and quantum electrical device serves as the primary standard for the unit of mass in the International System of Units (SI) or metric system. It uses a high-accuracy comparison of electrical power that’s measured in terms of quantum voltage and resistance with the mechanical power of a physical kilogram mass in motion. But that’s not all