All but the most basic infrared thermometers will provide recording features like a Max/Min function, that displays the maximum or minimum temperature recorded during a given measurement.
These features work best when you sweep the thermometer's field of view across a given range of targets to see variance. They often reset each time the thermometer's measurement trigger is pressed, giving you a different Min. or Max. each time you scan. Check your particular thermometer's user guide for more details.
Other common features include...
These extra features are particularly useful in food service or industrial settings where fixed operating procedures or government regulations specify adherence to certain temperature ranges.