A temperature stabilizer for accurately stabilizing the temperature of an object is provided. The position of the visual identifier corresponds to the location coordinates received from the at least one other portable electronic device, which correspond to an actual location of the at least one other portable electronic device. The method includes selecting fields of the database that are to be analyzed, ranking the fields in order of pertinence to the quality that is to be measured, fetching values for each record of the database from the fields that are to be analyzed and comparing the fetched values to a standard. Then, a p type well layer is formed in the n type region by ion-implantation.