Secchi Disk

The Secchi disk, created in 1865 by Angelo Secchi, is a plain white, circular disk 30 cm (12 in) diameter used to measure water transparency or turbidity in bodies of water. The disc is mounted on a pole or line and lowered slowly down in the water. The depth at which the disk is no longer visible is taken as a measure of the transparency of the water. This measure is known as the Secchi depth and is related to water turbidity.

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