This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Micro Holes . NIST researchers and collaborators have developed new method for measuring the interior dimensions of small holes with an uncertainty of only nanometers Here glass probe is inserted into an optical ferrule device for connecting optical fibers used in communications systems See also nist gov htm shadow www nist gov