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Secchi disk

Rated 4.50 out of 5 based on 6 customer ratings
(6 customer reviews)

$55.00 $49.00

The Secchi disk is a simple device used to measure turbidity, which is essentially the water clarity.

Though high turbidity is often a sign of poor water quality and land management, crystal clear water does not always guarantee healthy water.  Extremely clear water can signify very acidic conditions or high levels of salinity.

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Sold By: Water Rangers Store
SKU: WR0024 Categories: ,

Description

Features:

  • 20 cm diameter
  • Opposing black and white quarters
  • Calibrated line attached, marked every half meter in black, and full meter with a red tie

Turbidity

Turbidity is a measure of the ability of light to pass through water, essentially the measurement of the water’s murkiness. Measuring murkiness gives an estimate of suspended solids in the water. Turbidity measurements also take into account algae and plankton present in the water. Secchi discs’ ropes are marked at half metre and metre intervals. You measure how far you can lower the disc into the water until you can’t see it anymore. This is known as the secchi depth. If your disc touches the ground, but you can still see it, you can record ‘bottom visible’.

 

 

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Additional information

Weight .67 kg
Dimensions 21.5 × 20 × 5.5 cm

6 reviews for Secchi disk

  1. Rated 5 out of 5

    Kim Emde

    Simple and easy to use, the Secchi disk provides extremely valuable information to add to your testing regimen.

  2. Rated 3 out of 5

    Jenn Cuff

    The secchi disk is easy to use. The design could be improved with a “firmer” material to wrap the line around… perhaps a thicker square shape foam, or a “tubular” shaped material. Recording water depths could be more precise with improved markings (painted depth markings on the rope)

  3. Rated 5 out of 5

    Greg Ellis

    A nice lightweight (but not too light) Secchi disc that is also useful for checking water depths. Easy to store and easy to use!

  4. Rated 4 out of 5

    Kathryn Lindsay

    The secchi disk provides a couple of valuable measurements: water clarity and for locations that are not too deep, water depth. It is easy to use, durable and stores well in the Water Ranger kit. 1 m lengths are denoted by flagging tape; 0.5 m by a knot in the line. It would benefit from more measurement markers on the rope perhaps every .25m for knots (with flagging still a 1 m intervals). I found the spool for the line worked fine, was lightweight and presumably floats (didn’t have occasion to test) as long as the bottom is closer than the full length of the line!

  5. Rated 5 out of 5

    Jérôme Marty

    Start using the simple and yet effective most popular disk for freshwater scientists: the Secchi Disk ! This year marks the 200th anniversary of Angelo’s Secchi’s birth and therefore a long history of measurement of water clarity.
    This tool is recommended for everyone starting to measure water quality. Everyone (not just scientists!) can use it: just lower the disk in the water and see it disappear to assess the Secchi depth. The Secchi disk comes with a rope and weight to make sure it goes down easily.

  6. Rated 5 out of 5

    S. Dubreuil

    Fantastic piece of kit. Used to establish both water clarity and depth in shallower waters. Is very simple to use and gives immediate, tangible information about visibility. Great info for scuba divers as well.

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