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Types of Temperature

Celsius (°C)
Celsius (°C)

They both measure the same thing (temperature!), but use different numbers: Boiling water (at normal pressure) measures 100° in Celsius, but 212° in Fahrenheit

Digital Thermometers
Digital Thermometers

The best digital thermometers. It's hard to find fault with the simple, versatile design of an inexpensive digital thermometer. A good, basic digital thermometer can give years of accurate, reliable readings at very little cost.

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Electronic ear Thermometer
Electronic ear Thermometer

Ear thermometers will give you an incorrect and low reading if there is "wax" in the ear of the person having their temperature checked. Before using an ear thermometer at home, have your caregiver check the ears of the person needing their temperature checked.

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Fahrenheit (°F)
Fahrenheit (°F)

The Fahrenheit scale is a temperature scale based on one proposed in 1724 by Dutch-German-Polish physicist Daniel Gabriel Fahrenheit (1686–1736). It uses the degree Fahrenheit (symbol: °F) as the unit. Several accounts of how he originally defined his scale exist.

Forehead Thermometers
Forehead Thermometers

Forehead thermometers, sometimes called temporal thermometers or classified in the more general category of infrared thermometers, offer rapid, non-invasive temperature readings.

Glass and Mercury Thermometers
Glass and Mercury Thermometers

Mercury-in-glass thermometer for measurement of room temperature. Daniel Fahrenheit's mercury-in-glass thermometer was far more reliable and accurate than any that had existed before, and the mercury thermometers in use today are made in the way Fahrenheit devised.

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Infrared
Infrared

An infrared thermometer is a thermometer which infers temperature from a portion of the thermal radiation sometimes called black-body radiation emitted by the object being measured.

Langmuir Probes
Langmuir Probes

A Langmuir probe is a device used to determine the electron temperature, electron density, and electric potential of a plasma. It works by inserting one or more electrodes into a plasma, with a constant or time-varying electric potential between the various electrodes or between them and the surrounding vessel.

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Negative Temperature Coefficient (NTC) Thermistor
Negative Temperature Coefficient (NTC) Thermistor

NTC Thermistors are non-linear resistors, which alter their resistance characteristics with temperature. The resistance of NTC will decrease as the temperature increases. The manner in which the resistance decreases is related to a constant known in the electronics industry as beta, or ß.

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Other Thermometers
Other Thermometers

Thermometers can be calibrated either by comparing them with other calibrated thermometers or by checking them against known fixed points on the temperature scale. The best known of these fixed points are the melting and boiling points of pure water.

Pacifier Thermometer
Pacifier Thermometer

These thermometers use an infrared scanner to measure the temperature of the temporal artery in the forehead. This type of thermometer can be used even while a child is asleep. This type of thermometer can be used even while a child is asleep.

Plastic “Fever” Strip Thermometers
Plastic “Fever” Strip Thermometers

A liquid crystal thermometer, temperature strip or plastic strip thermometer is a type of thermometer that contains heat-sensitive (thermochromic) liquid crystals in a plastic strip that change colour to indicate different temperatures.

Pyrometer
Pyrometer

A pyrometer is a type of remote-sensing thermometer used to measure the temperature of a surface. Various forms of pyrometers have historically existed.

Rankine
Rankine

Zero on both the Kelvin and Rankine scales is absolute zero, but a temperature difference of one Rankine degree is defined as equal to one Fahrenheit degree, rather than the Celsius degree used on the Kelvin scale. Thus, a temperature of 0 K (−273.15 °C; −459.67 °F) is equal to 0 °R, and a temperature of−458.67 °F equal to 1 °R.

Resistance Temperature Detector (RTD)
Resistance Temperature Detector (RTD)

The resistance temperature detector (RTD) measures the electrical conductivity as it varies with temperature. The electrical resistance generally increases with temperature, and the device is defined as having a positive temperature coefficient. The sensor is the combination of the transducer and electronics that measure the resistance.

Semiconductor-Based Sensors
Semiconductor-Based Sensors

Introduction to Semiconductor Temperature Sensors. The semiconductor (or IC for integrated circuit) temperature sensor is an electronic device fabricated in a similar way to other modern electronic semiconductor components such as microprocessors. Typically hundreds or thousands of devices are formed on thin silicon wafers.

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Thermistors
Thermistors

Thermistors differ from resistance temperature detectors (RTDs) in that the material used in a thermistor is generally a ceramic or polymer, while RTDs use pure metals. The thermistors are in the form of beads, rods and discs but RTDs are in different shapes and sizes.

Thermocouple
Thermocouple

A Thermocouple is a sensor used to measure temperature. Thermocouples consist of two wire legs made from different metals. The wires legs are welded together at one end, creating a junction. This junction is where the temperature is measured. When the junction experiences a change in temperature, a voltage is created.

Thermocouples
Thermocouples

A Thermocouple is a sensor used to measure temperature. Thermocouples consist of two wire legs made from different metals. The wires legs are welded together at one end, creating a junction. This junction is where the temperature is measured. When the junction experiences a change in temperature, a voltage is created.

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