The present invention describes a method for an apparatus for examining surface properties. The display timing control circuit includes an output pixel clock generator, a display timing generator, and a clock adjusting unit. If ownership is substantiated for the particular request, the content may also be served. Accordingly, the development of the nitriding reaction is controlled so that it is possible to develop the nitriding reaction at a lower temperature. Another example of the jewelry includes a solar cell in electrical connectioncommunication with the lighting device. When the adjustment portion is free, the securing portion engages with the supporting portion, and the keyboard holds the selected inclination.