I did some recon on the Oktis-2 and in every case that I saw, it read the same value (incorrectly) regardless of fuel. The video you linked shows it reading 110 while testing 91 octane. Another test I saw had it read 99 no matter what fuel was used.
The Zeltex is legit, but you pay for that legitimacy, to the tune of around $6,000.
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