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The rain gauge was invented by christopher wren in 1441
The thermometer was invented in 1709 by Daniel Gabriel Fahrenheit. It is used to measure the air temperature. an instrument used for measuring and indicating temperature. When it gets colder or warmer the red line rises or lowers and whatever numbered mark it lands on that is the temperature.
The barometer was invented 1643, by Evangelista Torricelli.The barometer measures air pressure. an instrument measuring atmospheric pressure. It tells you if the air pressure is rising or lowering.