A temperature sensing device accurately determines the core temperature of a warm blooded animal or human based on at least one measurement of the temperature of the skin of the warm blooded animal or human. The device includes a housing, and a first contact type temperature sensing element coupled to the housing. The first contact type temperature sensing element includes a first temperature sensor that is operative to measure the temperature of the skin when the first contact type temperature sensing element is in contact with the skin. The first temperature sensor produces at least a first signal representative of the measured skin temperature. An electronic circuit uses the first signal to determine the core temperature of the warm blooded animal or human. An electronic communication device, such as a display, is coupled to the electronic circuit for communicating the core temperature to a user.