The infrared thermometer measures the surface temperature of an object by receiving the energy emitted, reflected and conducted by the target object. The detection element inside the thermometer collects the energy information and transmits it to the microprocessor for processing, which then converts it into a temperature reading for display. In models with a laser sight, the laser sight is only used for aiming. The performance description is shown in Table 1.

To obtain an accurate temperature reading, the distance between the thermometer and the test object must be within an appropriate range. The "spot size" refers to the area of the measurement point of the thermometer. The farther you are from the target, the larger the spot size. The ratio of distance to spot size, or D:S.

When determining the measurement distance, ensure that the diameter of the target is equal to or greater than the spot size of the measured point.

The selection of an infrared thermometer can be divided into three aspects:

1. Performance indicators, such as temperature range, spot size, working wavelength, measurement accuracy, window, display and output, response time, protective accessories, etc.;
2. Environmental and working conditions, such as environmental temperature, window, display and output, protective accessories, etc.;
3. Other selection aspects, such as ease of use, maintenance and calibration performance, and price, also have an impact on the selection of the thermometer.

With the continuous development of technology, the best design and new progress of infrared thermometers provide users with various functions and multi-purpose instruments, expanding the selection range. Other selection aspects, such as ease of use, maintenance and calibration performance, and price. When choosing a thermometer model, first determine the measurement requirements, such as the temperature of the object to be measured, the size of the object to be measured, the measurement distance, the material of the object to be measured, the environment where the object is located, response speed, measurement accuracy, whether to use portable or online, etc.; In the comparison of various existing thermometer models, select the instrument model that can meet the above requirements; Among the many models that can meet the above requirements, select the best combination in terms of performance, function and price.