One conceivable application would be the food, the equipment may be kept there as a small service for guests, whether as a game (who is drunk ...) either as a test of whether more can be chauffeured legal home. Perhaps it can also be used in clubs, etc., but I'm not sure how high would the acceptance. Surely useful is something for employees of social services, etc.
The device is compact and very well made. The mouthpieces are affordable, regular calibration and, both, however, is not cheap. I would have bought it to me I certainly non- drink maybe a glass of champagne in the year when it comes up.