Exactly how the device actually measures, can be judged hardly since it first, only measures the surface temperature and must be done to others while having very different material properties. Reflective materials, for example naturally distort the measurement result.
Nevertheless, the measuring pistol is a useful tool when it comes, for example, how quickly cools a hob or the temperature at which the residual heat indicator turns off, or the detection of thermal bridges in the house. I have among other things, multiple measurements taken at a double glazed window whose disc has already drawn air, and compared with the value determined all completely intact windows on the same side of the house. Result: Yes, there is a difference in the thermal insulation that can achieve this window yet, but this difference is so small. that an exchange is not super-piece appears. In addition, we have examined further suspected thermal bridges and actually get confirmed and checked the just made our attic insulation "through their paces". All results are plausible - no outliers, no major variations in multiple measurements at the same place and with varying distance to the measured object.
Even if the thermometer so should not show too well, it still remains an extremely useful tool.
