Most people are familiar with the single fingerprint scanner used in one-to-one verifications such as those found in IT systems and the 4-4-2 ten-print scanner used in one-to-many applications such as police bookings and border control. Yet there is a lesser-known cousin of theirs that is also worth knowing— the two-finger scanner.
Also called dual fingerprint scanner, the two-finger scanner might be a bit more obscure, but it serves a unique purpose — to bridge the gap between single-finger scanners and the ten-print scanners, combining portability with high image quality. This, as shall be seen later, makes it the perfect option for large-scale implementations.
