The Epsilon uses a Fujitsu MFB200 fingerprint sensor (Fujitsu
Ltd, Japan), which has 76800 sensing elements arranged in a rectangular array measuring 12.8mm x 15mm.
The contact surface is coated with a 2µm thick protective layer of SiO2.
Each sensing element measures 50µm x 50µm and responds to the dielectric
permittivity (dielectric constant) of the sample in contact with it. The native sensor
response is digitised with 8-bit (0-255) resolution.