Open-source testing platform capable of performing Nitrate Reductase Nitrate-Nitrogen Analysis Method. This allows you test for nitrates in water, soil, etc.
Arduino compatible - read the tests on your Android device.
Resource Link 1: BOM, electronics and instructions
A special request for a YouTube user Ryotaiku, Hena from Legend of Zelda: Twilight Princess. (See resource link for model download source.)
PLEASE DOWNLOAD FILES AT:
Modular Recycling System for 3D printers.
-shredder for plastics
..all in one package. These subsystems are on independent bases