DIY Digital Salinometer Project
A high school junior from Massachusetts named Daniel Kramnik submitted an entry for Water Quality Science Olympiad event. His project is an award winning Digital Salinometer.
This electronic solution has a theoretical accuracy of +/-0.0014% salinity, but some serial dilution is required to bring the sample into its range.
ORIGINAL ARTICLE: http://hackedgadgets.com/2012/01/11/diy-digital-salinometer/

by Robert
"The distance is very far. I would have no doubt that you could control it from 100ft -200ft or more. ..."