Handheld Raman spectrometer.
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Previously:
https://www.homemadetools.net/forum/...465#post189269
https://www.homemadetools.net/forum/...298#post204202
https://www.homemadetools.net/forum/...003#post137753
https://www.homemadetools.net/forum/...569#post147437
https://www.homemadetools.net/forum/...634#post197597