Advantages

"Who you are" systems like fingerprint scanners have a number of advantages over other systems. To name few:
• Physical attributes are much harder to fake than identity cards.
• You can't guess a fingerprint pattern like you can guess a password.
• You can't misplace your fingerprints, irises or voice like you can misplace an access card.
• You can't forget your fingerprints like you can forget a password.
• Dirty or greasy hands don’t hamper the quality of templates recorded by a hand reader.
• Buddy punching, the problem faced by most of the organizations, is solved by these biometric devices.
• Employee card systems are completely eliminated, thereby saving the cost of maintaining employee records and removing the possibility of frauds.
• Cost for manual preparation of reports like worked hours, lateness, leaves etc is also reduced by hand recognition devices.
• These devices are fast, accurate and can be easily integrated in the existing environment


References:
1. http://techbiometric.com/biometric-products/hand-scanner/
2. http://computer.howstuffworks.com/fingerprint-scanner5.htm