Can infrared digital thermometers measure temperatures of all kinds of surfaces?

No. There are certain instances where these thermometers either completely fail to work or provide inaccurate and unreliable readings. Some examples of such instances are when the surface is not stationary, when the surface is located in vacuum, when the surface is surrounded by a strong electromagnetic field, etc. In any circumstances where the laser beam cannot be concentrated for a few seconds on the surface, infrared thermometers fail to work.

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Infrared thermometers also tend to work inaccurately with shiny surfaces. However, it is not impossible to use them to take readings of such surfaces. All you have to do is coat the surface in such a way that it is not too shiny and then use the thermometer.

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There is yet another instance when infrared thermometers might provide wrong readings. Infrared thermometers take time to get acclimatized with the surrounding temperature in case there is a drastic change in the same. For example, if you have kept the thermometer in a freezing temperature and then you take it to a sauna room to measure the temperature of an object, then there is a possibility that you might get a wrong reading. Therefore, in order to get reliable readings, it is important that you give time to these infrared devices to get used to the surrounding temperature.

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