Turner Designs is a leading manufacturer of innovative optical instrumentation specializing in environmental and water quality monitoring. Founded in 1972 and headquartered in San Jose, California, the company develops fluorometers, turbidimeters, and sensors designed to measure chlorophyll, cyanobacteria, CDOM/FDOM, oil in water, and other fluorescent compounds. Our products are widely used in oceanography, freshwater research, aquaculture, wastewater treatment, and industrial process monitoring.

Turner Designs is particularly well-known for its rugged, field-ready instruments such as the Trilogy Laboratory Fluorometer, C3 Submersible Fluorometer, and the Cyclops-7 Sensor, all designed to deliver reliable, real-time data in challenging environments. We emphasize high sensitivity, ease of use, and durability, and instruments are trusted by academic researchers, government agencies, and private industry worldwide.

Committed to advancing environmental stewardship, Turner Designs continuously collaborates with scientists and engineers to support a broad range of monitoring applications and regulatory compliance efforts, including ballast water testing, oil spill response, and biogeochemical research.