Usually it takes 3-5 minutes, better than 3 minutes, but less than 5 minutes to measure the underarm temperature with a mercury thermometer. If the mercury thermometer is used to measure under the armpit for more than 5 minutes, it will lead to high body temperature and false positive measurement. If you use a mercury thermometer to measure the body temperature in the anus, you should generally stay in the anus for at least 5 minutes, otherwise you will not be able to measure the deep body temperature.

Matters needing attention of mercury thermometer

1. Never use a broom to directly sweep mercury, because mercury will be adsorbed on the broom, causing broom pollution. If you continue to use the broom, there will be the possibility of mercury poisoning.

2. Check yourself for injuries, because mercury can enter the human body through broken skin, causing mercury poisoning.

Remember to wash your hands after cleaning. It is best to wash your hands with sulfur soap, because mercury can react with sulfur and reduce its toxicity.