Fieldmaster (Educational Use) Secchi Disc, 20 cm Diameter with 20m Line

Product Code #623-2010

This sturdy plastic Secchi disk is 200 mm in diameter (7-7/8”) and has four quadrants, two white and two black. We include 20 meters of 1/8” diameter line on a 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.

Please note that this unit is designed for occasional student use only and is not meant to replace the 171, 171-CL or  58-B10 Professional Secchi Disks.