barometer
anemometer
A barometer is an instrument used to measure atmospheric pressure. It can measure the pressure exerted by the atmosphere by using water, air, or mercury. Pressure tendency can forecast short term changes in the weather. Numerous measurements of air pressure are used within surface weather analysis to help find surface troughs, high pressure systems, and frontal boundaries.
Barometers, such as mercury and aneroid barometers, are commonly used to measure atmospheric pressure. Other instruments like electronic pressure sensors and weather balloons equipped with instruments can also measure atmospheric pressure.
A rain gauge is the weather instrument used to measure the amount of rainfall. Rain gauges collect and measure the volume of precipitation that falls at a specific location over a certain period of time.
This would be a barometer. When the air pressure drops, you can expect rain or other bad weather like thunderstorms. On the other hand, when the air pressure rise, you can expect better weather. You can tell by using a barometer.
An anemometer is used to measure
Meteorology is the area of technology associated with weather instruments. These instruments are used to measure and track various weather parameters such as temperature, humidity, wind speed, and precipitation to help in weather forecasting and analysis.
The ceilometer instrument.
The atmosphere has numerous measurable properties, including pressure, temperature, humidity, velocity. Each of these is measured by a different instrument. Pressure is measured by a barometer, temperature is measured by a thermometer, etc.That would be a barometer. I assume you are referring to atmospheric pressure.
A tape measure.
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The pressure tendency would likely be rising if fair weather is approaching. This is because high pressure systems are associated with fair weather, leading to a rise in atmospheric pressure.