How do you use an infrared thermometer?

The forehead strip thermometer, developed in the 1990's, is a disposable strip of plastic with liquid crystals embedded into the strip. To take a person's temperature, one places the strip against the person's forehead. The liquid crystals react with the temperature of the skin. After waiting anywhere from a few seconds to a few minutes, depending on the brand, the crystals will change color. The thermometers have a number line that shows the temperature based on the color displayed. These are great for use with infants and young children. Keep in mind, though, studies have shown that this type of forehead thermometer is not always accurate. It will, however, give you an idea whether or not the child has a fever.