I can't tell if it's closer to 25 or 10
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Yep, I see it just slightly darker than 25 I'd say you're around 30 - 35ppm.I see in between 25 and 50.
looks like about 25 to me. Wait till you get around 10 and try to figure out what it is :)
Yep, it's no spectrophotometer for sure. But the OP was asking for differentiating between 10 and 25. The app would have given the same results as this thread with that first pic.The problem with that app is, it's going to be thrown off by any shadows or inconsistencies in the shade due to variations of water depth. it's basically a color picker.
Ok, thanks!You want diffused natural light. so blinds closed. :)