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I’m working with a watershed groups located in a watershed with intense CAFO activity. They are interested in monitoring DO continuously using the Mayfly EnviroDIY Monitoring Station. I was recommended the Zebra-Tech Optical DO sensor which costs nearly 3500. I’m sure this is a great sensor but is a little expensive for this group. Any recommendations on a quality DO sensor that will work with the Mayfly Logger board that is in the 1k-1.5k range?