Michigan Sea Grant
Water Quality
Learners observe water samples and measure the samples' water quality. Students develop their own criteria for measuring water quality and test for temperature, acidity, oxygen levels, turbidity, conductance, sediment and hardness.
Texas Instruments
Texas Instruments: Jason: Does Clear Water Mean Healthy Water?
JASON Aquatic Field Study: Explore how most aquatic animals and plants need clear water to survive by performing an experiment to measure the water clarity of a local aquatic site.
Science Education Resource Center at Carleton College
Serc: Using a Secchi Disk or Transparency Tube
This EPA resource provides instructions for using Secchi disks and transparency tubes to measure water clarity.