The present disclosure provides a mirror device with illumination comprising a transparent conductive substrate, an isolation layer, a mirror layer and a light emitting diode layer. In one embodiment, a test structure is provided that includes a test element having a first side and an opposing second side. In some embodiments, the composition has characteristics such that at a temperature of 20\xb0 C. After having heated up within the PFC decomposition device 9, the PFC is decomposed by the action of a catalyst which is filled within the PFC decomposition device 9. The yogurt composition is directly acidified when the pH of the composition reaches a pH of about 4. In one embodiment, three images to be compared are displayed at matched positions on an image display after going through the position-matching process conducted by the position matching means, in which the vertical positions of a structural feature area of the object are aligned horizontally.