Diagnose - sure, but screening - I'd argue about that.

Withings device mentioned in the article costs around 170$ and probably could be shared beyond few times use. Is it that expensive?

ADHD is very visible in certain cases (and still not diagnosed) and probably could be screened on class level with normalized questionnaires. Hand results over to parents and let them decide if they want to pursue diagnosis or not.

The new sleep apnea device he used is really simple and easy. I think we'll see it utilized a lot more often.