Hello guys, can anyone tell me how to make my own NPK sensor. i go through the internet and found many kits but they all use big kit including some testing capsules, etc. it is very lengthy process and have to be done manually. my aim is to make a stand alone device that can do all these stuff its…

NPK sensor

wvmarle November 15, 2017, 10:00am 11

The web page of this device mentions generic fertiliser, not NPK.

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