I'll check it out, though I'm not looking at dissolved oxygen levels in liquids. Everyone always complains about my paragraph lengths. I've never been able to get my arms around what I'm doing wrong. Maybe my wife can coach me. Thanks for the feedback.
I am doing a biology project in which I needed to measure the O2 in the test chamber to determine how much activity I had. The Oxygen sensor I bought on eBay was long expired and useless. O2 instruments were at least $120 used. So I began looking for a simple cheap solution to do it with common...