A hand and finger geometry scanner scans all of the fingers, it does not analyze any of the fingerprints.The hand and finger geometry scanner is simply dealing with the size of the hand, the length and width of each finger, and the shape of the hand as a result of the finger sizes. A fingerprint lock, on the other hand, does not deal whatsoever with the size or shape of the hand or fingers, but rather picks up and analyzes the fingerprint of one particular finger. Although most fingerprint locks can register more than one fingerprint to allow access to more than one person or more than one finger of the same person they still deal with only one fingerprint at a time