In the 1990s, NIST researchers and their colleagues created a high-tech “ruler” known as a frequency comb. Today, the frequency comb is used for medical diagnostics and more. It’s one of many examples of NIST’s research making a big impact. Learn more: ↧ NIST Inventions Are Powering Our World NIST experts are working to bring our measurements out of the lab and to the places where our users need them — saving time and money.