From Habr.

aaa: I don't know why, but I love when there are all sorts of sensors in the smartphone :) So of course the technology will be useful. And different chemical/biological analysis would be great at all.
Why is this in the smartphone?
CCC: Why Why? From medical express diagnostics to product quality checks.
ddd: wrote on the smartphone, then sneaked in the yogurt
Eeee, what has gone?