77912

Watermark Limnological Weighted Secchi Disc

Watermark Limnological Weighted Secchi Disc

Description

This 20cm diameter secchi disc is made of Sintra PVC.

Features

  • Silk screened with black and white quadrants
  • Stainless steel hardware
  • Built-in 24 oz. zinc sounding weight
Your Price
$62.49
Usually ships in 3-5 days

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Details

Silk screened with black and white quadrants, the WaterMark limnological 20cm diameter weighted secchi disc is made of Sintra PVC.
Notable Specifications:
  • 20 cm diameter secchi disc
  • 24 oz. zinc sounding weight
What's Included:
  • (1) Stainless steel hardware secchi disc
  • (1) Built-in 24 oz. zinc sounding weight
Image Part # Product Description Price Stock Order
Watermark Limnological Weighted Secchi Disc 77912 Limnological weighted secchi disc
$62.49
Usually ships in 3-5 days

In The News

Long-term Secchi disk records show Lake Tahoe clarity decline has stabilized

Lake Tahoe is one of the clearest lakes in the United States, helped by the relatively small size of its surrounding watershed and the granitic basin it sits in. Around 1968, the first year that its clarity was measured by Secchi disk, Tahoe’s blue waters were even clearer than they are today. Measurements at that time show an average yearly clarity of more than 100 feet. But such clarity was never reported again as its waters began a decline that lasted well into the 1990s. At that point, the decline of average annual clarity measurements leveled out and stabilized, which is better news than it sounds.

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Secchi Dip-in encourages citizen monitoring this summer

A monitoring initiative named for Secchi disks encourages people across the world to test the water nearby from the end of June through mid-July. It’s called the Secchi Dip-in and its organizers want anyone with the means to test their local water to do so and report back.  The database is open to contributions from June 29 through July 21. Volunteers, monitoring groups and professionals alike can contribute data to the Secchi Dip-in database.  Turbidity data is the main information Secchi Dip-in organizers want to see, but they won’t turn down any kind of water quality data people contribute. They encourage interested environmentalists to go out with someone who is experienced in testing for water quality to ensure data is accurate.

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Sustainable, Sponge-like Material Takes the Color Out of Dyes

Dyes are part of manufacturing everything from clothing to food all over the world. In fact, every year about 700,000 metric tons of dye change the hue of consumer goods. However, about ten percent of that dye ends up in the world's waterways, sometimes with toxic results. Even non-toxic dyes pose a threat in the environment, because changing the color of the water in streams, lakes, holding ponds, and rivers can mean interfering with plants' ability to photosynthesize. This, in turn, disrupts the rest of the local ecosystem.

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