Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Certification of NBS SRM 1691 ::0.3-[mu]m-diameter polystyrene spheres



Thomas R Lettleri, Gary G Hembree
- NBS IR 88-3730
Report Number
NBS IR 88-3730


Lettleri, T. and Hembree, G. (1988), Certification of NBS SRM 1691 ::0.3-[mu]m-diameter polystyrene spheres, , National Institute of Standards and Technology, Gaithersburg, MD, [online], (Accessed May 26, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created January 1, 1988, Updated May 19, 2023