Does any of you know about a cheap sensor to measure salinity in estuarine waters?

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Guido Bongi

Probably the Arduino platform allows several sensors of this type at around 5 $. A compuetr, as in http://www.elechouse.com/elechouse/index.php?main_page=product_info&cPath=&products_id=2233 and to get start with the platform that is open source, https://www.arduino.cc/en/Guide/HomePage

nicolas gratiot

Thank you for your prompt response. The matter is that such sensor is not rugged enough. In the past, I used some vemco sensors for water temperature. I look for something similar but for salinity.

http://vemco.com/products/minilog-ii-t/

Any conductivty probe, possibly with temperature sensor could meet the platform, but power supply, remote control and waterproof housing require either a skilled engineering or expensive equipment, possibly Pasco if available hag got an intermediate range of sensors