A Thermometer measures warmness, or the temperature.
![](//2.bp.blogspot.com/_xn0yBATc9ZY/S94qPmkPEhI/AAAAAAAAACA/Wn05GPntt2k/s1600/thermometer.jpg)
A barometer is an instrument that accurately measures atmospheric pressure.
![](//4.bp.blogspot.com/_xn0yBATc9ZY/S94q2ycQPEI/AAAAAAAAACI/9yVzNrBY2Dc/s1600/barometer.jpg)
A psychrometer is an instrument used to measure relative humidity. It is also referred to as a wet/dry bulb thermometer. The unit used is %. The instrument consists of 2 thermometers mounted on a handle with a chain. One bulb is 'dry', meaning it has nothing in it, and one is 'wet' meaning that it has a wet cloth wrapped around the bulb. Click here to read more
![](//2.bp.blogspot.com/_xn0yBATc9ZY/S941171Gi8I/AAAAAAAAACQ/pvvqybuf90c/s1600/psych..jpg)
An anemometer is an instrument used to measure wind speed. Wind speed can be measured in any unit of speed.
![](//4.bp.blogspot.com/_xn0yBATc9ZY/S943_RWq3fI/AAAAAAAAACY/EcD9xgQVexo/s1600/anemometer.gif)
a rain gauge is a device or instrument for measuring rain. (click here to read more)
![](//3.bp.blogspot.com/_xn0yBATc9ZY/S946QxSzXlI/AAAAAAAAACg/KH-3_Vi7E0E/s1600/rain+gauge.jpg)
a hygrometer is any instrument that's used to measure humidity
Relative humidity is a term used to describe the amount of water vapor that exists in a gaseous mixture of air and water vapor."
The heat index (HI) is how hot it feels, termed the felt air temperature
![](http://2.bp.blogspot.com/_xn0yBATc9ZY/S94qPmkPEhI/AAAAAAAAACA/Wn05GPntt2k/s1600/thermometer.jpg)
A barometer is an instrument that accurately measures atmospheric pressure.
![](http://4.bp.blogspot.com/_xn0yBATc9ZY/S94q2ycQPEI/AAAAAAAAACI/9yVzNrBY2Dc/s1600/barometer.jpg)
A psychrometer is an instrument used to measure relative humidity. It is also referred to as a wet/dry bulb thermometer. The unit used is %. The instrument consists of 2 thermometers mounted on a handle with a chain. One bulb is 'dry', meaning it has nothing in it, and one is 'wet' meaning that it has a wet cloth wrapped around the bulb. Click here to read more
![](http://2.bp.blogspot.com/_xn0yBATc9ZY/S941171Gi8I/AAAAAAAAACQ/pvvqybuf90c/s1600/psych..jpg)
An anemometer is an instrument used to measure wind speed. Wind speed can be measured in any unit of speed.
![](http://4.bp.blogspot.com/_xn0yBATc9ZY/S943_RWq3fI/AAAAAAAAACY/EcD9xgQVexo/s1600/anemometer.gif)
a rain gauge is a device or instrument for measuring rain. (click here to read more)
![](http://3.bp.blogspot.com/_xn0yBATc9ZY/S946QxSzXlI/AAAAAAAAACg/KH-3_Vi7E0E/s1600/rain+gauge.jpg)
a hygrometer is any instrument that's used to measure humidity
Relative humidity is a term used to describe the amount of water vapor that exists in a gaseous mixture of air and water vapor."
The heat index (HI) is how hot it feels, termed the felt air temperature