Breath easier ...

Seen at my local car wash ...



Has anyone tried one of these? It reminds me of a home pregnancy test (But are they as accurate?)
And: Is there an adjustment/feature that can tell you when you have bad breath?
 Another invention I need: A voice-sensing device, discretely hidden on my person at parties, that lets me know when I've crossed the line into AssholeLand. Because my wife can't be with me at all times.