LCD thermometer
This is a great LCD thermometer.The circuit used the diode as the thermo sensor to measure more than +100°C.ICL7136 of Intersil (Harris) is used for the thermometer and is measuring the change of the forward direction minute voltages of the diode by the temperature. The 3-1/2 digits liquid crystal display (SP521PR) is used for the display. The most significant digit can display only “1″.The consumption electric power of ICL7136 is very small and it is possible to operate about 3 months continuously with the 9-V cell.
   LCD thermometer
Read more on LCD thermometer website
www.interq.or.jp