At least one indicator light is located on the body or probe sections of a thermometer to indicate to the user that adjustments should be made to the timing or probe cover positioning of the thermometer. Additionally or alternatively the thermometer retains and displays information from previous uses, and in particular displays information pertaining to how long ago the last temperature measure was taken. Additionally, the thermometer may include additional buttons which can function to toggle the display to provide various types of information to the user, or toggle between thermometer usage modes, icon display, and LED color, among others. In another aspect, an internal body section with an access door provides access to a button allowing the user to toggle the interface of the thermometer, such as whether the temperature output is in degrees Fahrenheit or degrees Centigrade.