Personally, I take video of the reaction over 90 seconds, so if it doesn’t match the gradient I’m expecting, I can replay it and watch for other analogues.
Depending on your tolerance for privacy, Gemini is okayish at reading the reactions if you’re specifically mentioning what test type you’re taking. Gemini live, specifically. Again, data privacy is the concern, if you’re worried about that. Some are, some aren’t. That part isn’t up for me to tell you what to do.
I will say, big props for you taking harm reduction safely. Tons of other info can be found googling DanceSafe or BunkPolice (I get my uppers tests from them)