Using a colorimeter

Using a colorimeter

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Credit: MARTYN F. CHILLMAID/SCIENCE PHOTO LIBRARY

Caption: MODEL RELEASED. Using a colorimeter. Student using a colorimeter to measure the cloudiness caused by micro-organisms in a liquid. The colorimeter measures the decrease in brightness of a beam of light being shone through the sample. These results can be used to estimate the number of micro-organisms present in the sample.

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