A test device and method for determining the presence or absence of an analyte in a fluid sample, the test device including a support bearing a mark thereon, and a matrix defining an axial flow path. As for the light reflected from the surface of wafer, polarization components in predetermined two directions perpendicular to each other are extracted by a beam splitter, and optical sensors receive the extracted light components to detect each intensity. The ice making section case comprises an ice chute inclined downward to the opening of the ice making section case, provided between an ice making section 16 and a sprinkler, for leading an ice block fallen from an ice making chamber to the opening. The diode has a rating for reverse voltages of, in particular, above about 400 V and preferably above about 500 V, and can be fabricated with the least possible process complexity and thus a small number of photo technologies and, in the edge region, can readily be equipped with a channel stopper for avoiding leakage currents and a chipping stopper for limiting the extent of saving defects. The video characteristics may be based on any combination of an average of interframe differential sums, a sum of absolute differences between each pixel value of the current macroblock and a mean pixel value of the current macroblock, and a quantization parameter. The composite barrier layer comprises an oxide layer formed by atomic deposition process and an insulating layer, for example a nitride barrier layer, formed over the oxide layer.