Not unusual to see no replies for this type of question pertaining to the equipment you have selected.
Utilizing IR is to measure ‘temperature changes/differences’ between an object of interest and its surrounding or ambient temperature. Just (2) of the things to take into consideration, when measuring temperature; A: the temperature range of your object and B: the temperature resolution you wish to achieve.
This is sub par thermal imaging equipment, Emil.
Feel free to borrow my Fluke Ti100 ‘General Use’ Infrared Camera to get a sense of why good equipment is most useful. I have taken some vivid thermograms with this camera.
These (2) miniature thermal cameras you posted are essentially manufactured gimmicks with dumbed down software and lenses.
Just my opinion.