I have an aquarium and I use a water quality tester when I suspect something is wrong. Before it was a colour stripe you have to compare with a reference printed on a package. Now it uses a camera and matches the color better for a better analysis. However, that app calls home directly to JBL, so they are building a profile on how I abuse my fish because every time it logs, it logs a bad situation. It also leaks the usage to jquery, google and crashlytics without notifying me or asking my consent.