Laser thermometers make it possible to measure the temperature of an object without direct contact. This can be helpful if the object is inaccessible or so hot that a close measurement is no longer possible. With just one click and in a matter of seconds, they can be used to determine the temperature. Therefore, they are ideal for many different areas of life.
With our informative laser thermometer test 2022 we would like to support you in your purchase decision for the right laser thermometer. For this purpose, we have compared the different types of laser thermometers with each other and clearly presented the respective advantages and disadvantages.
- 1 Weekly newsletter with the best personal finance tips
- 2 Summary
- 3 The Best Laser Thermometer: Our Picks
- 4 Buying and evaluation criteria for laser thermometers
- 5 Decision: What types of laser thermometers are there and which is the right one for me?
- 6 Guide: Frequently asked questions about laser thermometers answered in detail
- 6.1 What is a laser thermometer?
- 6.2 How does a laser thermometer work?
- 6.3 Who is a laser thermometer suitable for?
- 6.4 Where can a laser thermometer be used?
- 6.5 Can a laser thermometer also be used to measure fever?
- 6.6 How to use a laser thermometer correctly?
- 6.7 What are the dangers of using a laser thermometer?
- 6.8 How much does a laser thermometer cost?
- 6.9 What are the alternatives to a laser thermometer?
- With the help of a laser thermometer, temperatures can be measured quickly and without contact. It can be applied to a wide range of objects and substances and can therefore also effortlessly determine the temperature of hard-to-reach objects.
- Laser thermometers are available in different types and configurations. For this reason, they can be used for a wide range of applications in the home, trade or industry.
- However, care should be taken when handling laser thermometers, as the laser beam can cause injury and permanent damage if it comes into contact with the eyes.
The Best Laser Thermometer: Our Picks
Buying and evaluation criteria for laser thermometers
Laser thermometers are often also called pyrometers, infrared thermometers, contactless thermometers or temperature guns. They are used to measure the temperature of objects over a certain distance without having to touch the object directly.
However, since not every laser thermometer is suitable for every application and they differ in their features, the following criteria are used for comparison:
- Intended use
- Measuring range in degrees Celsius
- Measuring the ambient temperature
- Display illumination
In the following, we will go into these criteria in more detail.
Laser thermometers are a useful helper in many different situations. For cooks, even determining the surface temperature of food can be enough. For craftsmen, however, measuring the ambient temperature or the humidity in the room can also be useful to determine the risk of mould.
Therefore, when buying, pay attention to whether the laser thermometer should include additional features such as the hygrometer or the ability to measure the ambient temperature.
What do I want to use my laser thermometer for and what features should it have?
Measuring range in degrees Celsius
The temperature of an object can vary greatly. Therefore, for industrial use, it may be advantageous to choose a laser thermometer that is suitable for very high temperature ranges.
Depending on the device, temperatures from -50° to +5000° Celsius can be measured.
However, for use in normal households, devices up to a temperature of -50° to +900° Celsius should usually be sufficient.
Measuring the ambient temperature
Especially for craftsmen, a laser thermometer that measures the ambient temperature in addition to the surface temperature can be very useful. This makes it possible to measure not only the temperature of the object itself, but also that of the close-up area around the object.
For example, you can use these devices to test whether the air conditioner is also doing its job in the surrounding area. Or whether the oven itself has reached the desired temperature in addition to the food.
However, this feature is not built into all laser thermometers and is reflected in a somewhat higher price.
The humidity or air temperature in the room can also be determined by certain laser thermometers with the help of the built-in hygrometer. This makes it possible to detect places that may be susceptible to mould growth.
However, it is important to note that the hygrometer cannot measure humidity from a distance, but should be used close to the area to be examined.
Again, not every laser thermometer includes this feature.
The more important the determination of the temperature, the more attention should be paid to the accuracy of the laser thermometer. As a rule, commercially available laser thermometers have a measurement deviation of approximately ± 2° Celsius.
However, they are usually still too inaccurate for measuring body temperature, which is why a special medical laser thermometer should be used for this purpose.
In addition, the measurement accuracy can be influenced by other factors, such as the ambient temperature or the distance to the object. These should also be taken into account during the measurement.
The emissivity is a measure of how much heat radiation an object emits. Different materials have different emissivities because the emissivity changes with the nature of the surfaces and the temperature.
For example, metals with polished surfaces have a much lower emissivity than wood or water. The values of the different substances can be read in so-called emissivity tables.
For more accurate readings, it is therefore advisable to choose a device where the emissivity can be set manually. However, this function is more likely to be found in mid-range and high-end laser thermometers.
Not quite as relevant as the upper features, but still useful, is the background illumination of the display.
This means that you can still reliably read the temperature in darker rooms or switch off the light if necessary.
Decision: What types of laser thermometers are there and which is the right one for me?
Since laser thermometers are suitable for different purposes and can be used in different ways, the design of the laser thermometer must be taken into account. For the household, a handy laser thermometer can be much more practical than one for crafts or industry.
The following types of laser thermometers can be distinguished:
|Permanently installed laser thermometers|| - Used mainly in industry for continuous process monitoring
- Permanently installed
|Mobile laser thermometers|| - Wide range of uses for crafts and hobbies
- Common pistol-shaped design
|Pocket laser thermometers|| - Used mainly in household and food applications
- Small and compact
The different types of laser thermometers are explained in more detail below.
Guide: Frequently asked questions about laser thermometers answered in detail
What is a laser thermometer?
Due to the visible laser spot that the device emits, it can be directly recognised which area of the object is being measured.
How does a laser thermometer work?
The higher the temperature of the object, the more infrared radiation it emits.
This radiation is measured with the help of a laser thermometer by projecting it onto a detector in the device.
The detector then converts the radiation into an electrical signal in °Celsius or Fahrenheit and shows the temperature on a display.
Who is a laser thermometer suitable for?
- Household: Laser thermometers can be used to measure the temperature of various foods such as baby food, grilled meat, ice cubes and drinks or to determine the oven temperature. However, depending on their medical suitability, laser thermometers can also be used to measure body temperatures, such as fever.
- Trade and industry: Depending on the device, laser thermometers are also ideal for determining the temperature of walls, the room temperature and for measuring the humidity of rooms. This makes it ideal for determining the thermal insulation of buildings. The fire brigade can even use it to determine the heat of the fire. For geologists, for example, these devices are also suitable for evaluating the temperature of rocks or volcanoes.
Where can a laser thermometer be used?
When measuring the temperature of materials, however, their respective emissivities and surface properties should be taken into account in order to obtain accurate readings.
For example, the temperatures of the following materials can be measured:
- Various metals: e.g. aluminium, lead, iron, copper, steel, zinc
- Various substances: e.g. ice, rubber, wood, coal, leather, paper, water
Can a laser thermometer also be used to measure fever?
A classic laser thermometer from the trade is not suitable for measuring fever, as they may measure too inaccurately.
In addition, the retina of the eyes can be damaged by contact with the laser source! For this reason, care should be taken that the laser thermometer is really approved for medical use.
How to use a laser thermometer correctly?
- Laser point at the touch of abutton: To measure the temperature of an object correctly, the measuring point of the laser source, which appears when the corresponding button is pressed, must be aimed at the object.
- Aim directly at the object: During measurement, however, care should be taken to aim the measuring point directly at the object to be measured and not just at its container. For example, with baby food, the laser should be aimed directly at the food and not at the outer bottle.
- Observe distance: Depending on the device, the correct distance to the object must be observed, otherwise measurement errors may occur.
- Follow the operating instructions: As there are different devices for different purposes, be sure to read the operating instructions before use.
What are the dangers of using a laser thermometer?
When using laser thermometers, care must be taken that the laser beam does not get into the eyes.
This is because the light from the laser can dazzle and even cause irreparable damage to the eye. Therefore, great care must be taken when aiming the laser and it should be used very deliberately.
Laser attacks can even be prosecuted. Under no circumstances should the laser thermometer get into the hands of children. In the event of retinal burns or other problems, medical help should be sought.
How much does a laser thermometer cost?
It is therefore worthwhile to compare the different prices according to function and equipment and to read test reports.
|Mini laser thermometer||from about 15 €|
|Classic laser thermometer depending on features||about 15 € - 350 €|
|Infrared clinical thermometer||about 25 € - 85 €|
What are the alternatives to a laser thermometer?
- Touch thermometer: As an alternative to a laser thermometer, there are the classic touch thermometers, where the temperature of an object is measured by direct heat contact. These include, for example, liquid thermometers or gas thermometers.
- Thermographic cameras: In addition, thermographic cameras can be used as thermometers with the help of special software, which can create thermal images by colour mapping.
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