FIELD MASTER SECCHI DISK

Need to determine how clear the water is? Seeing may not be believing. Measure the turbidity or degree of visibility of the water youï ¿ ½ ï ¿ ½ ï ¿ ½ re testing with our limnological secchi disk. Results are meaningless if theyï ¿ ½ ï ¿ ½ ï ¿ ½ re not repeatable and canï ¿ ½ ï ¿ ½ ï ¿ ½ t be compared.

Our sturdy plastic secchi disk handily meets industry standards.
It is 200 mm in diameter ( 7-7/ 8ï ¿ ½ ï ¿ ½ ï ¿ ½ ) and has four quadrants, two white and two black.
We include 20 meters of 1/ 8ï ¿ ½ ï ¿ ½ ï ¿ ½ diameter line on an orange styrofoam form that will float if dropped in the water.

Plus instructions that are written at a basic level.

Most scientists use a Secchi Disk to determine the index of suspended matter in the water. The smaller the index - say, five feet - the more suspended material there is.
The water is, obviously, less transparent, with a lower degree of visibility.

You can also use a Secchi Disk to measure the depth of light penetration and can derive a rough estimate of the extent of the littoral zone.