Fontana Forni IR Thermometer is a compact infrared thermometer with an adjustable emissivity control. It has a 12:1 sensitivity window, about average for this type of thermometer. This means that it is sensitive to the temperature in a one foot diameter circle 12 feet from the gun. Click here to learn more about how infrared thermometers work.
Because the emissivity of the surface being measured affects the reading, one cannot expect great accuracy from an IR gun without knowing the subject’s emissivity and adjusting the thermometer to that value. Many objects have an emissivity close to 0.95. But many do not. Adjust expectations accordingly.

Conclusion
The market is flooded with inexpensive thermometers that perform like this one, so a price tag of over $50 seems a bit excessive. While this unit performed well, it doesn’t have a feature set that would set it apart from its lower-priced competitors. Caveat emptor!
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