Here's why:

* How Clinical Thermometers Work: Clinical thermometers measure body temperature using a variety of methods, including:

* Mercury thermometers: These older thermometers use the expansion and contraction of mercury to indicate temperature.

* Digital thermometers: These thermometers use a thermistor, a type of resistor that changes resistance based on temperature.

* Infrared thermometers: These thermometers measure infrared radiation emitted by the body.

* No Magnetic Components: None of these methods require magnets to function.

Therefore, a clinical thermometer does not need a magnet.