The present invention relates generally to electronic digital thermometers. In its particular aspects, the present invention relates to an electric digital thermometer self contained in a probe element which thermometer is configured forselective readout in either degrees Fahrenheit or degrees C. Electronic digital thermometers possess heretofore been proposed included a probe element connected by a cable any separate display chassis, Such devices have been cumbersome to use in practice and have had other disadvantages due to theirprovision for digital readout on only a single temperature scale. Further, it is difficult to determine in these devices when a particular temperature reading could looked into stabilized. A series of three indicator lamps are provided within rear of the probe for respectively indicating whether the temperature reading is increasing, decreasing or has stabilized. A differentiator is fed by the amplifier to form an output voltageindicative belonging to the rate of change of the temperature reading. This output voltage feeds a comparator means having three outputs for respectively driving the lamps. The outputs are respectively energized if the output voltage is as compared to apredetermined positive constant, less than the negative of the constant, and one of the constant and its negative. The circuit means includes an amplifier fed by the transducer which has selectable gain and bias parameters controlled by a switch mounted at the bed of the probe. The switch selects gain and bias parameters for enabling the display posted ineither degrees Fahrenheit or degrees C. Briefly, the aforementioned and other objects of the present invention are satisfied by providing are just looking for digital thermometer self-contained in an elongated probe carrying a temperature transducer at its front end and an electronic digitaldisplay at its rear end. Circuit means housed for the prove converts the analog output signal from the transducer to a digital signal for driving the display. Moreover, generally, the power source of a thermometer is moves the thermometer. It's hard to take out. The power lose from the backlight plate will cause a fantastic power reduction in the power source and thus the panel for this display unit can be dim. Furthermore the lifetime of the thermometer will trivial. The present invention is thus described, it will be obvious that exact may be varied in many aspects. Such variations are not to be contemplated a departure away from the spirit and scope of the present invention, and these modifications as very well be obvious to one skilled in the art are supposed to have been included within the scope of these claims. To achieve above objects, the present invention provides a presentation assembly of an electronic digital thermometer which comprises: a heat sensor, a display unit, a backlight plate, and a processor; wherein the heat sensor measures temperature; after measurement of temperature, if its detected that the temperature is decreased, the processor will actuate the backlight plate for illuminating the display phone. The display unit displays measured temperature values after measurement of temperature. The display unit is actuated with the backlight plate for displaying the measuring data. A buzzer is installed in the thermometer, after measurement of temperature, the buzzer will emit might seem. The processor can de-actuate automatically. The thermometer has an adjustment unit.