A thermometer includes a support structure and a heat conductive layer on an outer surface of the support structure. The heat conductive layer has a sensing portion and a temperature indication portion, and a structure with temperature indication markings is laid out along the temperature indication portion. A reversible temperature-sensitive color changing layer is formed on the temperature indication portion to overlap the structure of the temperature indication markings, in which the sensing portion is adapted for sensing a thermal contact surface of a user to conduct heat flow to the temperature-sensitive color changing layer, producing a sensed temperature and a color changing zone of the reversible temperature-sensitive color changing layer in response to the sensed temperature thereby exhibiting a corresponding temperature value.
