Limitations of Infrared Thermometers

Infrared thermometers are extremely useful when used in the right way and for the right applications. However, before you can develop confidence in their ability to give fast tem- peratures, you must understand their limitations.

Infrared thermometers:

• Only measure surface temperatures and NOT the internal temperature of food or other materials
• Require adjustments depending on the surface being measured
• Can be temporarily affected by frost, moisture, dust, fog, smoke or other particles in the air
• Can be temporarily affected by rapid changes in ambient temperature
• Can be temporarily affected by proximity to a radio frequency with an electromagnetic field strength of three volts per meter or greater
• Do not see through glass, liquids or other transparent surfaces - even though visible light like a laser passes through them (i.e. if you point an IR gun at a window, you'll be measuring the temperature of the window pane, not the outside temperature).

* In some cases, Infrared Thermometers can be MORE accurate than a surface probe because surface probes have their own temperature and can affect the surface being measured by coming into contact with it.