To check the temperature leads of an electronic thermometer for low temperature, they should be stirred in a container of crushed ice and pure water.
Electronic thermometers use thermoresistive devices, in which the electrical resistance alters in reaction to temperature changes, to detect temperature changes (Fig. 22-3). The tip of a probe contains this device, which could be a thermocouple or a thermistor.
The fastest and most accurate way to take a temperature is with a digital thermometer. Most medicine stores and supermarket pharmacies stock digital thermometers.
Heat sensors are used by digital thermometers to measure body temperature. You can use them to measure the temperature in your mouth, rectus, or armpit. Remember that armpit (axillary) temperature is often 12 to 1°F (0.6°C) colder than mouth readings when evaluating digital thermometer results.
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