@misc{40596,
  author = {Jeff Gust and Robert Graham and Michael Lombardi},
  title = {Stopwatch and Timer Calibrations (2009 edition)},
  year = {2009},
  month = {2009-01-28},
  publisher = {Special Publication (NIST SP), National Institute of Standards and Technology, Gaithersburg, MD},
  url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=50659},
  language = {en},
}