MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Student using a probe connected to a datalogger to record the pH and temperature of the water in a pond or river. This pH of 7.52 is close to neutral, while the temperature is 25 degrees Celsius. For a close-up of the datalogger, see C011/4562.
Model release not available. Property release not required.