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Hi everyone, I am using the API Feshwater Master kit so far. It is good to get a general impression, however the nitrate reading is very hard to read. Personally, I have a big difficulty to see the differences between 10 an 20 ppm or 40 and 80 ppm. What are better kits for more exact measures for nitrates? Any hints? You wonder why I need this? Its because I want to calculate nitrate build up and clearance parameters for my aquaponics project. Thank you, Sina