1. A battery-powered thermometer that registers temperature with electronic procedures with a heat-sensitive metal tip that is placed in the mouth and a computer chip electronically reads and displays the temperature in digital format.
2. A thermometer that uses a sensor, usually a thermistor, which is placed on or near an object which is being measured.
3. An instrument which is used to measure a temperature that operates with the action of an electronic sensor which is positioned next to the substance being measured.