A test strip is provided for use in the determination of the concentration of an a chemical in blood. The first substrate is supported by posts made of an electrode material while being spaced apart from the second substrate. Each symbol of the user’s password is associated with a particular characteristic included in one of the displayed images. In either case, a semiconductor topography having a metal layer with a mean surface roughness less than the mean surface roughness obtained during the deposition of the metal layer may be obtained.