Maximum thermometer

A maximum thermometer is a special thermometer for measuring the highest temperature in a certain period of time. A well-known example of this is the clinical thermometer .

The functional principle of a maximum thermometer consists in the fact that a mercury thread can expand unhindered when the temperature rises, but when the temperature falls it is fixed by a narrow point on the thermometer ball and thus tears off. To reset, the maximum thermometer must be shaken vigorously until it shows the current temperature again.