These thermometers contain a coil in the
probe made of two different metals that are bonded together. The two
metals have different rates of expansion. The coil, which is connected
to the temperature indicator, expands when it is heated. This food
thermometer senses temperature from its tip and up the stem for 2 to 2
The resulting temperature is an average of
the temperatures along the sensing area. These food thermometers have a
dial display and are available as oven-safe and instant-read.