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Instrument: DENSIOMETERS
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Description
A densiometer is used to determine amount of canopy closure. In
other words, you are deciding how much of the sky above you is
blocked by trees. When looking into a densiometer there is a
mirror image of what is above you (it works like a periscope on
a submarine).

To use a densiometer correctly it must be held level. When
looking into the densiometer you can see the trees above you.
If more than 50% of the view is covered by branches, leaves, or
limbs the canopy is closed. If less than 50% of the view is
covered by branches, leaves, or limbs the canopy is open.

Additional information available at
http://www.uwsp.edu/cnr/cwes/forestree/Toolbox/densiometer.htm

[Summary provided by the University of Wisconsin]