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Digital thermometers have a very simple processing mechanism that can be designed to produce a reliable reading. The sensor uses a single voltage to detect the temperature of an area. An electrical change in the area causes the sensor to detect a corresponding change in resistance in the surrounding area. The sensor converts the change in resistance to a temperature change and provides a readout in either degrees Fahrenheit or Celsius.
The most common type of digital thermometer is a self-contained unit. In this case, the temperature is read by the sensor through a battery that keeps a constant level of voltage. The battery is replaced once the temperature reaches a predetermined level. This type of high quality thermometer for fever is inexpensive and easy to use, but does not have the ability to measure extremely high temperatures.
Some newer versions of digital thermometer use a built in computer to calculate the temperature in the area being measured. A number of companies make thermonuclear devices that use digital signals to indicate the temperature of an area. These devices are not as accurate as those used in home thermometers, but they do provide a fairly accurate reading. Most electronic companies now offer a variety of thermonuclear devices on the market. They usually come with built in alarm systems for a more accurate temperature reading. When choosing a best digital thermometer, consider what type of accuracy you are looking for, the cost, and how long it will take for the reading to be available.