For digital stick thermometers, accuracy is required to ± 0.2°F or 0.1°C (when tested on a water bath), within the range of 98°F and 102.0°F.
In this regard, how does a digital thermometer show temperature?
Electronic Thermometers.
This device may be a thermistor or a thermocouple and is incorporated into the tip of a probe. Thermistors are very small and therefore respond rapidly to changes in temperature. The current flow from a thermistor is translated into a temperature reading that is displayed on a digital readout.
You should keep your mouth closed during this time. Place the thermometer tip under the tongue. Hold the thermometer in the same spot for about 40 seconds. Readings will continue to increase and the F (or C) symbol will flash during measurement.
Accordingly, is a digital thermometer under the tongue accurate?
Temperatures taken from the armpit are usually the least accurate. For older children and adults, oral readings are usually accurate — as long as the mouth is closed while the thermometer is in place.