Hand Geometric Readers are one of the reader products that uses biometric recognition technology. Just like other biometric technologies such as fingerprint reader, face recognition reader, retina recognition or iris recognition reader, voice recognition reader, signature recognition reader, capillary pattern analysis reader and so forth, hand geometry reader uses a part of human body for verification of claimed identity. HGR uses your right hand to verify who you are. It is also called palm recognition system by some people, but this HGR is using not only the surface of the palm, but also entire hand image in 3D form. This HGR and Fingerprint readers are two major biometric technologies that has been applied to the commercial use and widely accepted in the market today.

What are the differences between ID card based reader system and biometric reader based system?

There are very simple and clear differences between them.