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"The Smartfin is a surfboard fin with sensors that measure multiple ocean parameters including temperature, location, and wave characteristics (sensors that measure salinity, pH, dissolved oxygen, and chlorophyll are in development). Using an app on their phone, the data surfers acquire while in the water becomes accessible in near real-time to the world-wide scientific community." - Surfrider Foundation (http://www.surfrider.org/programs/smartfin)