This is the idea of the week. One of my first jobs was as a bartender and I often got in trouble for pouring too much alcohol into mixed drinks. Not that this would have prevented me from doing that but it would have at least been neat to have.
I can see why this wouldn’t be on most bottles sold at the liquor store but it seems pretty clear to me that a product that would mount to various bottles would probably do pretty well. I so a review of a separate, completely unrelated product, that helped people pour up to six shots at the same time.
I like this idea better.