MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
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.
Model release available. Property release not required.