Patent ID: 8573838

Claim:
A thermometer comprising: a protective structure; a tip member comprising a thermal contact surface, secured to the protective structure; a heat conductive layer comprising a sensing portion disposed in the tip member and a temperature indication portion disposed in the protective structure; a structure with temperature indication markings, being laid out along the temperature indication portion; and a reversible temperature-sensitive color changing layer, formed on the temperature indication portion to overlap the structure of the temperature indication markings, wherein the sensing portion is adapted for sensing the thermal contact surface to conduct heat flow to the reversible 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; wherein the temperature-sensitive color changing layer has a first color state in a prescribed temperature range and the first color state is employed to mask the structure of the temperature indication markings.