Secchi Disk is used to determine the transparency of water in lakes, streams, oceans, and other bodies of water. The disk is 9 inches in diameter with alternating black and white quadrants. By placing the disk in water and holding onto the string a user can measure the clarity and turbidity of water.
Secchi Disk
Gelsonlab HSPO-023 Secchi Disk with Lanyard for Easy Water Quality Testing Optical Instrument
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