Barometer

[Sarah]

Noun - Actually a devise for measuring pressure. Is commonly used by adults esp. teachers/coaches as any kind of obscure measurement. A PSAT, for example, acts as a barometer for how well you will do in the actual SAT.

[Oralee]

An instrument measuring atmospheric pressure, used especially in forecasting the weather and determining altitude.

[Jessica]

a device that measures air pressure and shows when the weather is likely to change