Hand geometry as the name suggests uses the shape of the hand to identify/verify the person. Unlike iris, face or fingerprints, the human hand isn't unique. The existing systems use finger length, thickness, and curvature for the purposes of verification but not for identification. Hand geometry is very reliable when combined with other forms of identification, such as personal identification numbers. Hand geometry data is relatively easier to collect compared to other technologies e.g. for fingerprint collection good frictional skin is required by imaging systems. Additionally, hand geometry can be easily combined with other biometrics, namely fingerprint. The system has seen good uptake in the construction industry where workers are clocked using hand readers.