The body temperature is an important health indicator and to assess it properly, the core temperature must be measured. Nowadays, most thermometers are electronic for improved accuracy and safety. Mercury thermometers are no longer used in medical applications due to the toxicity of mercury, and many countries have banned the classic mercury-in-glass thermometers for that reason.
Get a digital thermometer that can be used rectally and orally. Non-contact infrared forehead thermometer is available for measurements when children are sleeping. It is more comfortable than children’s rectal thermometers, more rapid and simpler than mouth thermometers and more flexible than contact forehead thermometers.