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| In this room, you will see several instruments against
the back wall. These instruments are called turbidimeters. They are
used to measure the cloudiness of the water which tells us how clean
the water is at that time. The turbidimeter shine light into the water
and the particles in the water reflect that light back into a photocell.
The amount of reflected light picked up by the photo cell indicates
the cloudiness of the water. |
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