I am using an AirQualityEgg unit in my greenhouse to monitor temperature and humidity. It also provides readings of CO and NO2. I will setup another NO2 sensor closer to the water -- then see if there is a correlation between water nitrates and NO2 readings on the sensor.
You can get sensors from here, http://www.wickeddevice.com/
You can see my readings here, https://cosm.com/feeds/96569
You can get more info here, http://airqualityegg.com
Disclaimer: the sensors are not temperature corrected so you will see relative humidity go over 100%. Also, the readings at cosm include the raw sensor readings as well as the calculated information (not my doing - this is provided as part of the airqualityeggs).
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