First, when purchasing an infrared thermal imager, it's crucial to carefully inquire about the measurement temperature range. This range directly impacts the extent of the temperature range we can measure. We must select an appropriate temperature range based on our intended use to obtain accurate images, allowing us to use the measurement results to guide problem-solving. The user's desired temperature range must be accurately and comprehensively considered; it shouldn't be too narrow or too wide. An excessively wide range may result in inaccurate sensing, affecting measurement results. In short, with the increasing number of infrared thermal imager manufacturers, it's best to choose a reputable brand. When purchasing, be sure to inquire about the measurement temperature range and relevant quality certifications.

Second, the infrared thermal imager's response speed to changes in the measured temperature is another important question to ask. Scientifically, it's defined as the time required to reach 95% of the energy at the final reading. In other words, the time from when the detector receives the temperature signal to when the image is displayed is closely related to the time constant of the signal processing circuit and the display system. Modern infrared thermal imagers generally have very fast response times, and they can display different response times depending on the characteristics of the object. It's crucial to clarify these details to ensure timely resolution of any problems.