barometer

A barometer is a device that measures atmospheric pressure. Barometers help meteorologists figure out what the weather is going to be like.

Sure, it's technically a weather man's tool — but you can use barometer more generally to describe anything that can be used to forecast or measure something else. The stock market is a barometer for economic health. Your grades are a barometer of how you're doing in school. For the President, a national poll is a barometer of political success. These kinds of barometers tell which way the wind is blowing — just not literally.

Definitions of barometer
1

n an instrument that measures atmospheric pressure

Types:
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aneroid, aneroid barometer
a barometer that measures pressure without using fluids
barograph
a recording barometer; automatically records on paper the variations in atmospheric pressure
mercury barometer
barometer that shows pressure by the height of a column of mercury
weatherglass
a simple barometer for indicating changes in atmospheric pressure
Type of:
measuring device, measuring instrument, measuring system
instrument that shows the extent or amount or quantity or degree of something

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