Wait, countries are deciding WHO crosses their borders!? Outrageous!

Cheap pyrometers have a fixed emissivity setting (usually high, like 0.9). If the material you are trying to measure has low emissivity, you will grossly underestimate the temperature.

Cheap pyrometers have a fixed emissivity setting (usually high, like 0.9). If the material you are trying to measure…

Exactly. This is for yuppie parents that want to say “see, my kids are so imaginative and they love the outdoors... just look... he picked up a stick and is using it to play with.”