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Photometer for Nitrate Testing
Open-source testing platform capable of performing Nitrate Reductase Nitrate-Nitrogen Analysis Method. Arduino compatible - read the tests on your Android device. This allows you test for nitrates in water, soil, etc.TechForTrade
A free software license that requires that all work based on this must also be free software as in freely remixable and sharable by anyone under the same license but may be used commercially.
BOM and instructions: http://www.appropedia.org/Open-Source_Photometric_System_for_Enzymatic_Nitrate_Quantification
For technical details see paper: Wittbrodt BT, Squires DA, Walbeck J, Campbell E, Campbell WH, Pearce JM. (2015) Open-Source Photometric System for Enzymatic Nitrate Quantification. PLoS ONE 10(8): e0134989. doi: 10.1371/journal.pone.0134989 open access: https://www.academia.edu/14702947/Open-Source_Photometric_System_for_Enzymatic_Nitrate_Quantificatio...
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