Process for the production of gasoline with a low sulfur content that comprises at least the following two stages:. The transistor maintains its characteristics even after being subjected to a high temperature and high humidity environment. The pixel electrodes and the source wiring are formed in different layers via an insulating film, the source wiring has a main line portion and extension portions extended from both sides of the main line portion, and the extension portion is formed of a transparent conductive material. When the measured value is not within the expected range, the hardness tester determines that detection of a zero point has failed. A heat sink is also enclosed within the insulating body, the heat sink making electrical contact with the first conduction terminals of the first and second chips on the respective front surfaces, so that the first conduction terminals are electrically connected together through the heat sink.