Secchi disk

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Secchi disk

n.
A disk, divided into black and white quarters, used to gauge water clarity by measuring the depth at which it is no longer visible from the surface.

[After Pietro Angelo Secchi (1818-1878), Italian astronomer hired to test such a disk.]
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References in periodicals archive ?
Seasonal patterns of chlorophyll, nutrient concentrations and Secchi disc transparency in Florida lakes.
If there are any doubts at all about the water's clarity, a Secchi disc is a simple tool used to qualitatively measure water clarity (or alternately it's "turbidity").
However, on the whole Secchi disc transparency was low at the littoral sites being minimum at site-III which may be due to the increased suspended matter, silt load and humus brought in from the catchment area as well as due to rich macro-vegetation.
Transparency was evaluated using a standard 20cm diameter Secchi disc having black and white quarters.
Transparency was measured with a Secchi disc, and silicate according to the method of Mullin & Riley (Aminot & Chaussepied 1983).
Transparency was determined with a 30 cm diameter Secchi disc.
Graves uses a Secchi disc to monitor algae growth in Lake Shirley.
Sometimes a Secchi disc is used, which is a multicolored device approximately 6 inches in diameter.
At each site, physical parameters were measured using a YSI, an air thermometer, and a secchi disc.