Embodiments of the present invention encompass systems and methods for use in identity authentication. The height gage includes a first leg attached to the base and extending along a second direction that is not parallel to the first direction and a second leg attached to the first leg and comprising a support portion extending along a third direction that is not parallel to the second direction. A method of protecting anchor bolts utilizing the grout cap is also described. On a single screen, the invention displays an image of the shape of a spectacle frame, a plurality of regions of comfortable vision and the difference in vision due to the difference in the Abbe number is evaluated from the display. A data component includes data to be read by the scanner. This is achieved by coating the metal substrate surface with an aqueous liquid composition that contains acrylate polymer resin, wax, and hexavalent chromium and then drying this coating into place on the surface to produce the desired dry coating.