Secchi disk
Uit Kust Wiki
Definition of Secchi disk:
A Secchi disk is a black and white, 20-cm diameter disk used for measuring the turbidity of water. The disk is lowered into the water until it just disappears from sight. The depth at which the disk disappears is called the Secchi depth.
This is the common definition for Secchi disk, other definitions can be discussed in the article
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