The presence of these options indicates the thermometer was designed to be used by anyone around the world.
Temperature or how cold/hot something is can be measured using different units. The most common units for temperature include:
Moreover, the unit used has been culturally established. For example, in the US the most common unit is Farhenheit, but in the UK the most common unit is degrees Celcius.
Luckily, some thermometer manufacturers have noticed this cultural difference, and thermometers with two or more units have been created. The purpose of these thermometers is that they can be used and understood by people all around the world.
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