The EOS 1 is a simple and open-source smartphone-based spectrometer for measuring nitrates (NO3−) and phosphates (PO43−) in water. It is an easy-to-use and sufficently accurate tool for the average citizen to investigate and better understand their local water resources.
This device is partly inspired by the Public Lab Spectrometer.
Make One Better
The DualSpec is a simple and open-source smartphone-based spectrometer designed for the introductory chemistry laboratory.
This device is documented here.