Posted by alice on Monday, June 2, 2008 at 1:20pm.
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
http://www.bbc.co.uk/weather/weatherwise/activities/weatherstation/cloud_instruments.shtml
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