Is the Oligocheck transcutaneous photospectrometer useful?

[Zebraspruce]

Hello,
what are your opinions on transcutaneous spectrometers for mineral analysis? I am considering trying one, called Oligoscan. (https://www.so-check.world/en/oligocheck).

If it works, it seems a rather attractive option. Even so, to me it smells a bit of that debacle with Elizabeth Holmes.

What are your thoughts on this technique and device? I could not find anything searching the forum.