A technique for detecting whether or not a pinhole is present in an organic film on a concrete surface, by detecting the conductivity of the concrete in advance. An annular image obtained by illuminating the concave surface is photographed, and the XY-coordinates of the deepest position of the concave surface are obtained based on the image thus obtained. An outlet coupling portion is arranged at the lower flange close to the upper frame. The fulfillment system uses a remote device to provide information to consumers. The second layer comprises a metal anodic to the metal substrate. Drive motors are coupled to the module to enable it to track the sun during the course of the day.