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Hi, I am Businessman I found this sample from https://www.indomonster.com and think it might be useful to you. ------------------------------------------------------- FIELD MASTER SECCHI DISK 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. For detailed information, please go to http://www.indomonster.com/OctaPrimaLestari/1278453
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