Multi-Biometric machines have two or more biometric technologies combined into a single unit, mostly used for Time Attendance and Access Control solutions.
There are several multi-biometric machines being designed & used globally, however the most popular choice remains Fingerprint + Face Recognition combined into a single unit. Such terminals provide convenience of use through Fingerprint / Face Recognition & even RFID.
Multi-biometric systems overcome the challenges where one single technology may not work. Organizations can then assign separate mode or a combination mode to mark their attendance & access on the machines.
Each of the biometric technology within a multi-biometric system usually operates as per its own pre-requisites & results.