to identify the user, they rely on a unique attribute of the user, such as a hand print, finger print, finger vein, palm vein, facial recognition, iris or retina. The user will have their attribute scanned into the system. Biometric readers are often used in conjunction with an access control system, granting the user access to a building, and at the same time clocking them in recording the time and date. These systems also attempt to cut down on fraud such as "buddy clocking." When combined with an access control system they can help prevent other types of fraud such as 'ghost employees', where additional identities are added to payroll but don't exist. See also Time and attendance Time discipline Timekeeper Timesheet Game clock Stopwatch Workforce management References External links IBM Time Clocks (PDF files) National Museum of American History: International Dial Time Recorder Clock www.timerecorder.de/ (mostly in German, but partly translated into English) is one of the most comprehensive online documentations of the history of time recorders and time clocks Harlow Bundy's home in Binghamton, it was restored and now houses a museum dedicated to the Bundys. https://www.huntonprivacyblog.com/2017/06/01/washington-becomes-third-state-enact-biometric-privacy-law/ https://codes.findlaw.com/tx/business-and-commerce-code/bus-com-sect-503-001.html Products introduced in 1888 Clocks Working time