HomeNewsWhat's the difference between forehead thermometer, ear thermometer and mercury thermometer?

What's the difference between forehead thermometer, ear thermometer and mercury thermometer?

2020-05-13
In 2020, the novel coronavirus was formed as a global epidemic. For a while, masks, thermometers, disinfectant water and so on became hot commodities. In order to effectively prevent the new coronavirus, people need to measure their body temperature in all kinds of public places. And many people will also buy a temperature thermometer for home use, recording the daily temperature changes of their families. So, do you know the difference between Forehead Thermometer, ear thermometer and mercury thermometer? Do you know their advantages and disadvantages?

Understand the significance of temperature measurement

Human body temperature is one of the important vital signs reflecting the physiological state of the body. Body temperature is affected by nerve center regulation and diseases, so it is important to measure body temperature for diagnosing diseases. According to whether the temperature measurement device is in direct contact with the human body, the temperature measurement methods are divided into contact temperature measurement and non-contact temperature measurement. Forehead thermometer and ear thermometer are non-contact thermometers, while mercury thermometer is contact thermometers.

Medical Forehead Thermometer

1.Working Principle

1)Forehead Thermometer

When the temperature of any object is higher than absolute zero (- 273 "C), it will send out infrared rays. The forehead Temperature Gun receives the infrared rays from the forehead through the sensor to get the temperature sensing data.

2)Ear Temperature Gun

The lower colliculus is the center of human body temperature, and the tympanic membrane temperature is proportional to the change of the lower colliculus temperature. The ear temperature gun indirectly obtains the lower colliculus temperature by scanning the thermal energy released by the membrane and surrounding tissues through infrared ray, so as to obtain the human body temperature.

3)Mercury Thermometer

Based on the principle of mercury volume expansion and contraction, the length of mercury column in glass tube is changed obviously to read.


2.Usage Method

Advantage

1)Forehead Thermometer

① The measurement time is short.
② No direct contact with human body, reduce pollution.
③ LCD display, easy to read.

2)Ear Temperature Gun

The same as forehead thermometer

3)Mercury Thermometer

① Low price.
② Stable performance and small error.


Usage Method

1)Forehead Thermometer

Put the forehead temperature gun in the middle of the forehead and measure it at a distance of 5-6cm from the infrared ray.

2)Ear Temperature Gun

Before use, replace it with a new earmuff, and fix the auricle back and up, so that the ear canal is straight. Put the ear temperature gun probe into the ear canal for measurement.

3)Mercury Thermometer

Throw the mercury thermometer below 35 ℃ before use, and put it down in the armpit, cover the mercury head completely and read the data after sitting for 5 minutes.


Working principle and using method of three kinds of thermometers

Thermodetector

Advantage

Disadvantage

Forehead Thermometer


① The measurement time is short.

② No direct contact with human body, reduce pollution.

③ LCD display, easy to read.

It is greatly affected by the outside temperature.


Ear Temperature Gun


The same as forehead thermometer


① New earmuffs need to be replaced every time, with high economic cost.

② Unclean or dirty ear canal may cause low temperature measurement.

③ The external auditory canal is inflamed and deformed.

Mercury Thermometer


① Low price.

② Stable performance and small error.


① The measurement time is long.

② Immersion disinfection, operation trouble.

③ Fragile, leading to mercury pollution.


Clinical data show that the temperature difference of the forehead, ear and armpit has clinical significance. It can be considered that axillary temperature > ear temperature > frontal temperature


When the body temperature is normal, there is no significant difference among the three kinds of thermometers. Forehead thermometer or ear temperature gun can be used to replace the traditional mercury thermometers to improve the working efficiency. However, in the case of fever, there are significant differences in the values measured by the three thermometers. The traditional mercury thermometer is the "gold standard" for temperature measurement, so forehead thermometer or ear thermometer can not be used to replace the traditional mercury thermometer to avoid excessive error [3]. Therefore, the mercury thermometer is suitable for the temperature monitoring of the fever population. Ear temperature gun can reflect human body temperature more accurately than forehead thermometer, and the temperature measurement is fast, which is suitable for infants and young children who are easy to move and do not cooperate with temperature measurement. The frontal temperature gun is easy to operate and does not need human contact, so it is suitable for temperature screening of a large number of people.




To sum up, there is no better thermometer, please select the most suitable one according to the actual situation

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