What tool did the fingerprint scanner replace?

The main tool that the fingerprint scanner replaced was the punch clock in the work environment.

Many organizations used a punch clock system to allow their employees to punch in and out during times of work and breaks. But now with the fingerprint scanner organizations don't need to use a punch clock!

Instead of using a punch card to punch in and out of work, a simple placement of the thumb on a scanner now does the trick! The fingerprint scanner is a much simpler and efficient device over the old punch clock regiment.

http://www.usatoday.com/tech/news/techinnovations/2008-03-27-fingerprint-timecards_N.htm

http://www.foxnews.com/story/0,2933,342374,00.html