Editing Tuning fork (section)

=== Radar gun calibration ===
A [[radar gun]] that measures the speed of cars or a ball in sports is usually calibrated with a tuning fork.<ref>{{cite web|url=http://tf.nist.gov/timefreq/general/pdf/87.pdf|title=Calibration of Police Radar Instruments|publisher=National Bureau of Standards|date=1976|access-date=29 October 2008|archive-date=22 February 2012|archive-url=https://web.archive.org/web/20120222143735/http://tf.nist.gov/timefreq/general/pdf/87.pdf|url-status=dead}}</ref><ref>{{cite web| title = A detailed explanation of how police radars work | work = Radars.com.au | publisher = TCG Industrial|location= Perth, Australia | year = 2009 | url = http://radars.com.au/police-radar.php | access-date = 2010-04-08}}</ref> Instead of the frequency, these forks are labeled with the calibration speed and radar band (e.g., X-band or K-band) they are calibrated for.