research which instruments are needed to measure which feature of the weather

Temperature , Precipitation , Cloud cover , Cloud type , Wind direction , Wind speed , Visibility.

The example i have got is
visibility - eyes and instruments
Does the question mean you have to put either eyes instruments or both?

Yes, visibility can be measured by eyes. What kind of instrument can measure visibility?

These sites will help you.

http://schoolscience.rice.edu/duker/winstruments.html

http://www.weathershack.com/education/weather-measurement-tools.html

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To measure the different features of the weather, you generally need specific instruments. Here is a breakdown of the instruments typically used to measure each weather feature:

1. Temperature: Thermometer (can be a digital or a mercury-filled thermometer).
2. Precipitation: Rain gauge (measures rainfall amount), snow gauge (measures snowfall amount), and a tipping bucket rain gauge (measures rainfall intensity).
3. Cloud cover: Observers use visual estimates or specialized instruments like ceilometers or lidars.
4. Cloud type: Observers visually identify cloud types. Certain cloud types can be identified using satellite imagery or radar.
5. Wind direction: Wind vane or anemometer combined with a wind direction indicator.
6. Wind speed: Anemometer (typically a cup anemometer or a propeller anemometer).
7. Visibility: Visibility is generally measured using a visibility sensor that can be optical, acoustic, or a combination of both.

Regarding visibility, it can be measured using instruments alone (visibility sensors) or by visual estimation using the naked eye. It is not necessary to use both instruments and eyes; either one can be used depending on the situation.

To measure different features of the weather, you will need a combination of instruments and sometimes even your own observation skills. Here are examples of the instruments typically used to measure each weather feature:

1. Temperature: This can be measured using a thermometer, which comes in various types such as liquid-in-glass, digital, or infrared thermometers.

2. Precipitation: Instruments like rain gauges or tipping bucket rain gauges are used to measure the amount of rainfall. Other instruments, such as weather radars, can also provide information about precipitation intensity and location.

3. Cloud cover: This can be determined by visual observation or using instruments like ceilometers, which emit laser beams to measure the height of cloud bases.

4. Cloud type: Identifying cloud types can be done through visual observation. Tools like cloud atlases or mobile apps can help with cloud identification.

5. Wind direction: Anemometers, such as cup anemometers or wind vanes, are commonly used to measure wind direction. Wind socks or wind flags can also provide a general indication of wind direction.

6. Wind speed: Anemometers are also used to measure wind speed. Different types, including cup, propeller, and sonic anemometers, accurately measure wind speed.

7. Visibility: Visibility can be estimated by visual observation, but instruments like visibility sensors or transmissometers are used to measure visibility more precisely.

In the case of "visibility - eyes and instruments," it means that visibility can be assessed both through personal observation (using your eyes) and by using dedicated instruments.

Remember, while some weather features require specific instruments, your own observation skills and interpretation can also play a role in assessing the weather conditions.