Spectrophotometer

https://polaridad.es/sensor-radiacion-ultravioleta-arduino-indice-uv-uvm30a-guva-s12sd/

https://snowmix.sourceforge.io/Intro/about.html

https://publiclab.org/system/images/photos/000/026/339/original/DSLR_spectrometer.pdf

https://publiclab.org/search?q=chromatograph

https://publiclab.org/questions/falbriard/02-11-2019/is-a-spectrophotometer-able-to-detect-contaminants-and-traces-of-heavy-metals-like-lead-mercury-cadmium-chromium-arsenic-copper-and-nickel-which-is-the-best-method-for-continous-tracking-of-contaminants-in-river-water

https://publiclab.org/notes/gaudi/04-03-2014/diy-micro-volume-spectrophotometer

https://old.publiclab.org/search?q=spectrophotometer