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A comment on Declining eyesight improved by looking at deep red light. Parent comment
https://www.avantes.com/products/spectrometers/compactline/i...
You can get them used for below 1000$, eg this listing:
https://www.ebay.com/itm/Avantes-Compactline-Avaspec-Mini-/3...
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https://www.avantes.com/products/spectrometers/compactline/i...
You can get them used for below 1000$, eg this listing:
https://www.ebay.com/itm/Avantes-Compactline-Avaspec-Mini-/3...