LaMotte Secchi Disk, Black and White
Product Code: 171
The LaMotte® 0171 Secchi Disk is a 20 cm (7.9 in.) weighted black-and-white disk used to measure water transparency (Secchi depth) in lakes, reservoirs, ponds, rivers, and coastal waters. It is a simple, reliable field instrument for estimating water clarity, turbidity, and light penetration, making it an essential tool for limnology, aquaculture, fisheries, and environmental monitoring.
To use it, you slowly lower the disc into the water until it disappears, then raise it until it reappears, and average the two depths. This average depth is the Secchi depth, which indicates the water's turbidity.
- 20 cm weighted disk provides stable vertical descent through the water column.
- Alternating black-and-white quadrants maximize visibility and provide a consistent disappearance depth for water clarity measurements.
- Rugged HDPE construction resists impact, UV exposure, and corrosion.
- Compatible with standard Secchi lines for use in freshwater and marine environments.
- Lightweight and portable for routine field monitoring.
- Widely used in scientific, educational, and regulatory water quality programs.
